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Posted to commits@nifi.apache.org by jo...@apache.org on 2019/03/18 12:48:03 UTC
svn commit: r1855761 [40/46] - in /nifi/site/trunk/docs/nifi-docs: ./
components/org.apache.nifi/nifi-ambari-nar/1.9.1/
components/org.apache.nifi/nifi-ambari-nar/1.9.1/org.apache.nifi.reporting.ambari.AmbariReportingTask/
components/org.apache.nifi/ni...
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>PutSyslog</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">PutSyslog</h1><h2>Description: </h2><p>Sends Syslog messages to a given host and port over TCP or UDP. Messages are constructed from the "Message ___" properties of the processor which can use expression language to generate messages from incoming FlowFiles. The properties are used to construct messages of the form: (<PRIORITY>)(VERSION )(TIMESTAMP) (HOSTNAME) (BODY) where version is optional. The constructed messages are checked against regular expressions for RFC5424 and RFC3164 formatted messages. The timestamp can be an RFC5424 timestamp with a format of "yyyy-MM-dd'T'HH:mm:ss.SZ" or "yyyy-
MM-dd'T'HH:mm:ss.S+hh:mm", or it can be an RFC3164 timestamp with a format of "MMM d HH:mm:ss". If a message is constructed that does not form a valid Syslog message according to the above description, then it is routed to the invalid relationship. Valid messages are sent to the Syslog server and successes are routed to the success relationship, failures routed to the failure relationship.</p><h3>Tags: </h3><p>syslog, put, udp, tcp, logs</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Hostname</strong></td><td id="default-value">localhost</td><td id="all
owable-values"></td><td id="description">The ip address or hostname of the Syslog server. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Protocol</strong></td><td id="default-value">UDP</td><td id="allowable-values"><ul><li>TCP</li><li>UDP</li></ul></td><td id="description">The protocol for Syslog communication.</td></tr><tr><td id="name"><strong>Port</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The port for Syslog communication. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Max Size of Socket Send Buffer</strong></td><td id="default-value">1 MB</td><td id="allowable-values"></td><td id="description">The maximum size of the socket s
end buffer that should be used. This is a suggestion to the Operating System to indicate how big the socket buffer should be. If this value is set too low, the buffer may fill up before the data can be read, and incoming data will be dropped. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">SSL Context Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SSLContextService<br/><strong>Implementations: </strong><a href="../../../nifi-ssl-context-service-nar/1.9.1/org.apache.nifi.ssl.StandardRestrictedSSLContextService/index.html">StandardRestrictedSSLContextService</a><br/><a href="../../../nifi-ssl-context-service-nar/1.9.1/org.apache.nifi.ssl.StandardSSLContextService/index.html">StandardSSLContextService</a></td><td id="description">The Controller Service to use in order to obtain a
n SSL Context. If this property is set, syslog messages will be sent over a secure connection.</td></tr><tr><td id="name"><strong>Idle Connection Expiration</strong></td><td id="default-value">5 seconds</td><td id="allowable-values"></td><td id="description">The amount of time a connection should be held open without being used before closing the connection. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Timeout</td><td id="default-value">10 seconds</td><td id="allowable-values"></td><td id="description">The timeout for connecting to and communicating with the syslog server. Does not apply to UDP. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Batch Size</strong></td><td id="default-value
">25</td><td id="allowable-values"></td><td id="description">The number of incoming FlowFiles to process in a single execution of this processor. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Character Set</strong></td><td id="default-value">UTF-8</td><td id="allowable-values"></td><td id="description">Specifies the character set of the Syslog messages. Note that Expression language is not evaluated per FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Message Priority</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The priority for the Syslog messages, excluding < >.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)<
/strong></td></tr><tr><td id="name">Message Version</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The version for the Syslog messages.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Message Timestamp</strong></td><td id="default-value">${now():format('MMM d HH:mm:ss')}</td><td id="allowable-values"></td><td id="description">The timestamp for the Syslog messages. The timestamp can be an RFC5424 timestamp with a format of "yyyy-MM-dd'T'HH:mm:ss.SZ" or "yyyy-MM-dd'T'HH:mm:ss.S+hh:mm", " or it can be an RFC3164 timestamp with a format of "MMM d HH:mm:ss".<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Message Hostname</strong></td><td id="default-value">${hostname(true)}</td><td id="allowable-values"></td><td id="description">T
he hostname for the Syslog messages.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name"><strong>Message Body</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The body for the Syslog messages.<br/><strong>Supports Expression Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr></table><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles that are sent successfully to Syslog are sent out this relationship.</td></tr><tr><td>failure</td><td>FlowFiles that failed to send to Syslog are sent out this relationship.</td></tr><tr><td>invalid</td><td>FlowFiles that do not form a valid Syslog message are sent out this relationship.</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3>None specified.<
h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.standard.ListenSyslog/index.html">ListenSyslog</a>, <a href="../org.apache.nifi.processors.standard.ParseSyslog/index.html">ParseSyslog</a></p></body></html>
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+++ nifi/site/trunk/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.9.1/org.apache.nifi.processors.standard.PutTCP/index.html Mon Mar 18 12:47:56 2019
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>PutTCP</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">PutTCP</h1><h2>Description: </h2><p>The PutTCP processor receives a FlowFile and transmits the FlowFile content over a TCP connection to the configured TCP server. By default, the FlowFiles are transmitted over the same TCP connection (or pool of TCP connections if multiple input threads are configured). To assist the TCP server with determining message boundaries, an optional "Outgoing Message Delimiter" string can be configured which is appended to the end of each FlowFiles content when it is transmitted over the TCP connection. An optional "Connection Per FlowFile" parameter can be specified to change
the behaviour so that each FlowFiles content is transmitted over a single TCP connection which is opened when the FlowFile is received and closed after the FlowFile has been sent. This option should only be used for low message volume scenarios, otherwise the platform may run out of TCP sockets.</p><h3>Tags: </h3><p>remote, egress, put, tcp</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Hostname</strong></td><td id="default-value">localhost</td><td id="allowable-values"></td><td id="description">The ip address or hostname of the destination.<br/><stron
g>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Port</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The port on the destination.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Max Size of Socket Send Buffer</strong></td><td id="default-value">1 MB</td><td id="allowable-values"></td><td id="description">The maximum size of the socket send buffer that should be used. This is a suggestion to the Operating System to indicate how big the socket buffer should be. If this value is set too low, the buffer may fill up before the data can be read, and incoming data will be dropped.</td></tr><tr><td id="name"><strong>Idle Connection Expiration</strong></td><td id="default-value">5 seconds</td><td id="allowable-values"></td><td id="description">The amount of time a connection s
hould be held open without being used before closing the connection.</td></tr><tr><td id="name"><strong>Connection Per FlowFile</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Specifies whether to send each FlowFile's content on an individual connection.</td></tr><tr><td id="name">Outgoing Message Delimiter</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">Specifies the delimiter to use when sending messages out over the same TCP stream. The delimiter is appended to each FlowFile message that is transmitted over the stream so that the receiver can determine when one message ends and the next message begins. Users should ensure that the FlowFile content does not contain the delimiter character to avoid errors. In order to use a new line character you can enter '\n'. For a tab character use '\t'. Finally for a carriage return use '\r'.<br/><strong>Supports Expression
Language: true (will be evaluated using flow file attributes and variable registry)</strong></td></tr><tr><td id="name">Timeout</td><td id="default-value">10 seconds</td><td id="allowable-values"></td><td id="description">The timeout for connecting to and communicating with the destination. Does not apply to UDP</td></tr><tr><td id="name">SSL Context Service</td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>SSLContextService<br/><strong>Implementations: </strong><a href="../../../nifi-ssl-context-service-nar/1.9.1/org.apache.nifi.ssl.StandardRestrictedSSLContextService/index.html">StandardRestrictedSSLContextService</a><br/><a href="../../../nifi-ssl-context-service-nar/1.9.1/org.apache.nifi.ssl.StandardSSLContextService/index.html">StandardSSLContextService</a></td><td id="description">The Controller Service to use in order to obtain an SSL Context. If this property is set, messages will be sent over a secure connection.</td></
tr><tr><td id="name"><strong>Character Set</strong></td><td id="default-value">UTF-8</td><td id="allowable-values"></td><td id="description">Specifies the character set of the data being sent.</td></tr></table><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles that are sent successfully to the destination are sent out this relationship.</td></tr><tr><td>failure</td><td>FlowFiles that failed to send to the destination are sent out this relationship.</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3>None specified.<h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.standard.ListenTCP/index.html">ListenTCP</a></p></body></h
tml>
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>PutUDP</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">PutUDP</h1><h2>Description: </h2><p>The PutUDP processor receives a FlowFile and packages the FlowFile content into a single UDP datagram packet which is then transmitted to the configured UDP server. The user must ensure that the FlowFile content being fed to this processor is not larger than the maximum size for the underlying UDP transport. The maximum transport size will vary based on the platform setup but is generally just under 64KB. FlowFiles will be marked as failed if their content is larger than the maximum transport size.</p><h3>Tags: </h3><p>remote, egress, put, udp</p><h3>Properties: </h3><
p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Hostname</strong></td><td id="default-value">localhost</td><td id="allowable-values"></td><td id="description">The ip address or hostname of the destination.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Port</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The port on the destination.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></t
r><tr><td id="name"><strong>Max Size of Socket Send Buffer</strong></td><td id="default-value">1 MB</td><td id="allowable-values"></td><td id="description">The maximum size of the socket send buffer that should be used. This is a suggestion to the Operating System to indicate how big the socket buffer should be. If this value is set too low, the buffer may fill up before the data can be read, and incoming data will be dropped.</td></tr><tr><td id="name"><strong>Idle Connection Expiration</strong></td><td id="default-value">5 seconds</td><td id="allowable-values"></td><td id="description">The amount of time a connection should be held open without being used before closing the connection.</td></tr></table><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>FlowFiles that are sent successfully to the destination are sent out this relationship.</td></tr><tr><td>failure</td><td>FlowFiles that failed to send to the destinati
on are sent out this relationship.</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3>None specified.<h3>State management: </h3>This component does not store state.<h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component requires an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.standard.ListenUDP/index.html">ListenUDP</a></p></body></html>
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>QueryDatabaseTable</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">QueryDatabaseTable</h1><h2>Description: </h2><p>Generates a SQL select query, or uses a provided statement, and executes it to fetch all rows whose values in the specified Maximum Value column(s) are larger than the previously-seen maxima. Query result will be converted to Avro format. Expression Language is supported for several properties, but no incoming connections are permitted. The Variable Registry may be used to provide values for any property containing Expression Language. If it is desired to leverage flow file attributes to perform these queries, the GenerateTableFetch and/or Execu
teSQL processors can be used for this purpose. Streaming is used so arbitrarily large result sets are supported. This processor can be scheduled to run on a timer or cron expression, using the standard scheduling methods. This processor is intended to be run on the Primary Node only. FlowFile attribute 'querydbtable.row.count' indicates how many rows were selected.</p><h3>Tags: </h3><p>sql, select, jdbc, query, database</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Database Connection Pooling Service</strong></td><td id="default-value"></td><td id="all
owable-values"><strong>Controller Service API: </strong><br/>DBCPService<br/><strong>Implementations: </strong><a href="../../../nifi-dbcp-service-nar/1.9.1/org.apache.nifi.dbcp.DBCPConnectionPool/index.html">DBCPConnectionPool</a><br/><a href="../../../nifi-hive-nar/1.9.1/org.apache.nifi.dbcp.hive.HiveConnectionPool/index.html">HiveConnectionPool</a><br/><a href="../../../nifi-dbcp-service-nar/1.9.1/org.apache.nifi.dbcp.DBCPConnectionPoolLookup/index.html">DBCPConnectionPoolLookup</a></td><td id="description">The Controller Service that is used to obtain a connection to the database.</td></tr><tr><td id="name"><strong>Database Type</strong></td><td id="default-value">Generic</td><td id="allowable-values"><ul><li>Generic <img src="../../../../../html/images/iconInfo.png" alt="Generates ANSI SQL" title="Generates ANSI SQL"></img></li><li>Oracle <img src="../../../../../html/images/iconInfo.png" alt="Generates Oracle compliant SQL" title="Generates Oracle compliant SQL"></img></li><li
>Oracle 12+ <img src="../../../../../html/images/iconInfo.png" alt="Generates Oracle compliant SQL for version 12 or greater" title="Generates Oracle compliant SQL for version 12 or greater"></img></li><li>MS SQL 2012+ <img src="../../../../../html/images/iconInfo.png" alt="Generates MS SQL Compatible SQL, for version 2012 or greater" title="Generates MS SQL Compatible SQL, for version 2012 or greater"></img></li><li>MS SQL 2008 <img src="../../../../../html/images/iconInfo.png" alt="Generates MS SQL Compatible SQL for version 2008" title="Generates MS SQL Compatible SQL for version 2008"></img></li><li>MySQL <img src="../../../../../html/images/iconInfo.png" alt="Generates MySQL compatible SQL" title="Generates MySQL compatible SQL"></img></li></ul></td><td id="description">The type/flavor of database, used for generating database-specific code. In many cases the Generic type should suffice, but some databases (such as Oracle) require custom SQL clauses. </td></tr><tr><td id="name"
><strong>Table Name</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the database table to be queried. When a custom query is used, this property is used to alias the query and appears as an attribute on the FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Columns to Return</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A comma-separated list of column names to be used in the query. If your database requires special treatment of the names (quoting, e.g.), each name should include such treatment. If no column names are supplied, all columns in the specified table will be returned. NOTE: It is important to use consistent column names for a given table for incremental fetch to work properly.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr
><tr><td id="name">Additional WHERE clause</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A custom clause to be added in the WHERE condition when building SQL queries.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Custom Query</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A custom SQL query used to retrieve data. Instead of building a SQL query from other properties, this query will be wrapped as a sub-query. Query must have no ORDER BY statement.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Maximum-value Columns</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A comma-separated list of column names. The processor will keep track of the maximum value for each column that has been returned since the proces
sor started running. Using multiple columns implies an order to the column list, and each column's values are expected to increase more slowly than the previous columns' values. Thus, using multiple columns implies a hierarchical structure of columns, which is usually used for partitioning tables. This processor can be used to retrieve only those rows that have been added/updated since the last retrieval. Note that some JDBC types such as bit/boolean are not conducive to maintaining maximum value, so columns of these types should not be listed in this property, and will result in error(s) during processing. If no columns are provided, all rows from the table will be considered, which could have a performance impact. NOTE: It is important to use consistent max-value column names for a given table for incremental fetch to work properly.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Max Wait T
ime</strong></td><td id="default-value">0 seconds</td><td id="allowable-values"></td><td id="description">The maximum amount of time allowed for a running SQL select query , zero means there is no limit. Max time less than 1 second will be equal to zero.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Fetch Size</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The number of result rows to be fetched from the result set at a time. This is a hint to the database driver and may not be honored and/or exact. If the value specified is zero, then the hint is ignored.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Max Rows Per Flow File</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The maximum number of result rows th
at will be included in a single FlowFile. This will allow you to break up very large result sets into multiple FlowFiles. If the value specified is zero, then all rows are returned in a single FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Output Batch Size</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The number of output FlowFiles to queue before committing the process session. When set to zero, the session will be committed when all result set rows have been processed and the output FlowFiles are ready for transfer to the downstream relationship. For large result sets, this can cause a large burst of FlowFiles to be transferred at the end of processor execution. If this property is set, then when the specified number of FlowFiles are ready for transfer, then the session will be committed, thus releasing the FlowFiles to the downstr
eam relationship. NOTE: The maxvalue.* and fragment.count attributes will not be set on FlowFiles when this property is set.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Maximum Number of Fragments</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The maximum number of fragments. If the value specified is zero, then all fragments are returned. This prevents OutOfMemoryError when this processor ingests huge table. NOTE: Setting this property can result in data loss, as the incoming results are not ordered, and fragments may end at arbitrary boundaries where rows are not included in the result set.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Normalize Table/Column Names</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true<
/li><li>false</li></ul></td><td id="description">Whether to change non-Avro-compatible characters in column names to Avro-compatible characters. For example, colons and periods will be changed to underscores in order to build a valid Avro record.</td></tr><tr><td id="name">Transaction Isolation Level</td><td id="default-value"></td><td id="allowable-values"><ul><li>TRANSACTION_NONE</li><li>TRANSACTION_READ_COMMITTED</li><li>TRANSACTION_READ_UNCOMMITTED</li><li>TRANSACTION_REPEATABLE_READ</li><li>TRANSACTION_SERIALIZABLE</li></ul></td><td id="description">This setting will set the transaction isolation level for the database connection for drivers that support this setting</td></tr><tr><td id="name"><strong>Use Avro Logical Types</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Whether to use Avro Logical Types for DECIMAL/NUMBER, DATE, TIME and TIMESTAMP columns. If disabled, written as string. If e
nabled, Logical types are used and written as its underlying type, specifically, DECIMAL/NUMBER as logical 'decimal': written as bytes with additional precision and scale meta data, DATE as logical 'date-millis': written as int denoting days since Unix epoch (1970-01-01), TIME as logical 'time-millis': written as int denoting milliseconds since Unix epoch, and TIMESTAMP as logical 'timestamp-millis': written as long denoting milliseconds since Unix epoch. If a reader of written Avro records also knows these logical types, then these values can be deserialized with more context depending on reader implementation.</td></tr><tr><td id="name"><strong>Default Decimal Precision</strong></td><td id="default-value">10</td><td id="allowable-values"></td><td id="description">When a DECIMAL/NUMBER value is written as a 'decimal' Avro logical type, a specific 'precision' denoting number of available digits is required. Generally, precision is defined by column data type definition or database e
ngines default. However undefined precision (0) can be returned from some database engines. 'Default Decimal Precision' is used when writing those undefined precision numbers.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Default Decimal Scale</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">When a DECIMAL/NUMBER value is written as a 'decimal' Avro logical type, a specific 'scale' denoting number of available decimal digits is required. Generally, scale is defined by column data type definition or database engines default. However when undefined precision (0) is returned, scale can also be uncertain with some database engines. 'Default Decimal Scale' is used when writing those undefined numbers. If a value has more decimals than specified scale, then the value will be rounded-up, e.g. 1.53 becomes 2 with scale 0, and 1.5 with scale 1.<br/><stron
g>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table><h3>Dynamic Properties: </h3><p>Dynamic Properties allow the user to specify both the name and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">initial.maxvalue.<max_value_column></td><td id="value">Initial maximum value for the specified column</td><td>Specifies an initial max value for max value column(s). Properties should be added in the format `initial.maxvalue.<max_value_column>`. This value is only used the first time the table is accessed (when a Maximum Value Column is specified).<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table></p><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>Successfully created FlowFile from SQL query result set.</td
></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>tablename</td><td>Name of the table being queried</td></tr><tr><td>querydbtable.row.count</td><td>The number of rows selected by the query</td></tr><tr><td>fragment.identifier</td><td>If 'Max Rows Per Flow File' is set then all FlowFiles from the same query result set will have the same value for the fragment.identifier attribute. This can then be used to correlate the results.</td></tr><tr><td>fragment.count</td><td>If 'Max Rows Per Flow File' is set then this is the total number of FlowFiles produced by a single ResultSet. This can be used in conjunction with the fragment.identifier attribute in order to know how many FlowFiles belonged to the same incoming ResultSet. If Output Batch Size is set, then this attribute will not be populated.</td></tr><tr><td>fragment.index</td><td>If 'Max Rows Per Flow File' is set then t
he position of this FlowFile in the list of outgoing FlowFiles that were all derived from the same result set FlowFile. This can be used in conjunction with the fragment.identifier attribute to know which FlowFiles originated from the same query result set and in what order FlowFiles were produced</td></tr><tr><td>maxvalue.*</td><td>Each attribute contains the observed maximum value of a specified 'Maximum-value Column'. The suffix of the attribute is the name of the column. If Output Batch Size is set, then this attribute will not be populated.</td></tr></table><h3>State management: </h3><table id="stateful"><tr><th>Scope</th><th>Description</th></tr><tr><td>CLUSTER</td><td>After performing a query on the specified table, the maximum values for the specified column(s) will be retained for use in future executions of the query. This allows the Processor to fetch only those records that have max values greater than the retained values. This can be used for incremental fetching, fetc
hing of newly added rows, etc. To clear the maximum values, clear the state of the processor per the State Management documentation</td></tr></table><h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component does not allow an incoming relationship.<h3>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.standard.GenerateTableFetch/index.html">GenerateTableFetch</a>, <a href="../org.apache.nifi.processors.standard.ExecuteSQL/index.html">ExecuteSQL</a></p></body></html>
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+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></meta><title>QueryDatabaseTableRecord</title><link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"></link></head><script type="text/javascript">window.onload = function(){if(self==top) { document.getElementById('nameHeader').style.display = "inherit"; } }</script><body><h1 id="nameHeader" style="display: none;">QueryDatabaseTableRecord</h1><h2>Description: </h2><p>Generates a SQL select query, or uses a provided statement, and executes it to fetch all rows whose values in the specified Maximum Value column(s) are larger than the previously-seen maxima. Query result will be converted to the format specified by the record writer. Expression Language is supported for several properties, but no incoming connections are permitted. The Variable Registry may be used to provide values for any property containing Expression Language. If it is desired to leverage flow file attributes to perform these qu
eries, the GenerateTableFetch and/or ExecuteSQL processors can be used for this purpose. Streaming is used so arbitrarily large result sets are supported. This processor can be scheduled to run on a timer or cron expression, using the standard scheduling methods. This processor is intended to be run on the Primary Node only. FlowFile attribute 'querydbtable.row.count' indicates how many rows were selected.</p><h3>Tags: </h3><p>sql, select, jdbc, query, database, record</p><h3>Properties: </h3><p>In the list below, the names of required properties appear in <strong>bold</strong>. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the <a href="../../../../../html/expression-language-guide.html">NiFi Expression Language</a>.</p><table id="properties"><tr><th>Name</th><th>Default Value</th><th>Allowable Values</th><th>Description</th></tr><tr><td id="name"><strong>Database Connection Pooling Service</s
trong></td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>DBCPService<br/><strong>Implementations: </strong><a href="../../../nifi-dbcp-service-nar/1.9.1/org.apache.nifi.dbcp.DBCPConnectionPool/index.html">DBCPConnectionPool</a><br/><a href="../../../nifi-hive-nar/1.9.1/org.apache.nifi.dbcp.hive.HiveConnectionPool/index.html">HiveConnectionPool</a><br/><a href="../../../nifi-dbcp-service-nar/1.9.1/org.apache.nifi.dbcp.DBCPConnectionPoolLookup/index.html">DBCPConnectionPoolLookup</a></td><td id="description">The Controller Service that is used to obtain a connection to the database.</td></tr><tr><td id="name"><strong>Database Type</strong></td><td id="default-value">Generic</td><td id="allowable-values"><ul><li>Generic <img src="../../../../../html/images/iconInfo.png" alt="Generates ANSI SQL" title="Generates ANSI SQL"></img></li><li>Oracle <img src="../../../../../html/images/iconInfo.png" alt="Generates Oracle compliant SQL" tit
le="Generates Oracle compliant SQL"></img></li><li>Oracle 12+ <img src="../../../../../html/images/iconInfo.png" alt="Generates Oracle compliant SQL for version 12 or greater" title="Generates Oracle compliant SQL for version 12 or greater"></img></li><li>MS SQL 2012+ <img src="../../../../../html/images/iconInfo.png" alt="Generates MS SQL Compatible SQL, for version 2012 or greater" title="Generates MS SQL Compatible SQL, for version 2012 or greater"></img></li><li>MS SQL 2008 <img src="../../../../../html/images/iconInfo.png" alt="Generates MS SQL Compatible SQL for version 2008" title="Generates MS SQL Compatible SQL for version 2008"></img></li><li>MySQL <img src="../../../../../html/images/iconInfo.png" alt="Generates MySQL compatible SQL" title="Generates MySQL compatible SQL"></img></li></ul></td><td id="description">The type/flavor of database, used for generating database-specific code. In many cases the Generic type should suffice, but some databases (such as Oracle) requi
re custom SQL clauses. </td></tr><tr><td id="name"><strong>Table Name</strong></td><td id="default-value"></td><td id="allowable-values"></td><td id="description">The name of the database table to be queried. When a custom query is used, this property is used to alias the query and appears as an attribute on the FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Columns to Return</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A comma-separated list of column names to be used in the query. If your database requires special treatment of the names (quoting, e.g.), each name should include such treatment. If no column names are supplied, all columns in the specified table will be returned. NOTE: It is important to use consistent column names for a given table for incremental fetch to work properly.<br/><strong>Supports Expression Language: true (will be evaluat
ed using variable registry only)</strong></td></tr><tr><td id="name">Additional WHERE clause</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A custom clause to be added in the WHERE condition when building SQL queries.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name">Custom Query</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A custom SQL query used to retrieve data. Instead of building a SQL query from other properties, this query will be wrapped as a sub-query. Query must have no ORDER BY statement.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Record Writer</strong></td><td id="default-value"></td><td id="allowable-values"><strong>Controller Service API: </strong><br/>RecordSetWriterFactory<br/><strong>Implementations: </strong><a hre
f="../../../nifi-record-serialization-services-nar/1.9.1/org.apache.nifi.xml.XMLRecordSetWriter/index.html">XMLRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.1/org.apache.nifi.text.FreeFormTextRecordSetWriter/index.html">FreeFormTextRecordSetWriter</a><br/><a href="../../../nifi-scripting-nar/1.9.1/org.apache.nifi.record.script.ScriptedRecordSetWriter/index.html">ScriptedRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.1/org.apache.nifi.avro.AvroRecordSetWriter/index.html">AvroRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.1/org.apache.nifi.json.JsonRecordSetWriter/index.html">JsonRecordSetWriter</a><br/><a href="../../../nifi-record-serialization-services-nar/1.9.1/org.apache.nifi.csv.CSVRecordSetWriter/index.html">CSVRecordSetWriter</a></td><td id="description">Specifies the Controller Service to use for writing results to a FlowFile. The Record Writer may use Inherit Sc
hema to emulate the inferred schema behavior, i.e. an explicit schema need not be defined in the writer, and will be supplied by the same logic used to infer the schema from the column types.</td></tr><tr><td id="name">Maximum-value Columns</td><td id="default-value"></td><td id="allowable-values"></td><td id="description">A comma-separated list of column names. The processor will keep track of the maximum value for each column that has been returned since the processor started running. Using multiple columns implies an order to the column list, and each column's values are expected to increase more slowly than the previous columns' values. Thus, using multiple columns implies a hierarchical structure of columns, which is usually used for partitioning tables. This processor can be used to retrieve only those rows that have been added/updated since the last retrieval. Note that some JDBC types such as bit/boolean are not conducive to maintaining maximum value, so columns of these typ
es should not be listed in this property, and will result in error(s) during processing. If no columns are provided, all rows from the table will be considered, which could have a performance impact. NOTE: It is important to use consistent max-value column names for a given table for incremental fetch to work properly.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Max Wait Time</strong></td><td id="default-value">0 seconds</td><td id="allowable-values"></td><td id="description">The maximum amount of time allowed for a running SQL select query , zero means there is no limit. Max time less than 1 second will be equal to zero.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Fetch Size</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The number of result rows
to be fetched from the result set at a time. This is a hint to the database driver and may not be honored and/or exact. If the value specified is zero, then the hint is ignored.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Max Rows Per Flow File</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The maximum number of result rows that will be included in a single FlowFile. This will allow you to break up very large result sets into multiple FlowFiles. If the value specified is zero, then all rows are returned in a single FlowFile.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Output Batch Size</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The number of output FlowFiles to queue before committing the process s
ession. When set to zero, the session will be committed when all result set rows have been processed and the output FlowFiles are ready for transfer to the downstream relationship. For large result sets, this can cause a large burst of FlowFiles to be transferred at the end of processor execution. If this property is set, then when the specified number of FlowFiles are ready for transfer, then the session will be committed, thus releasing the FlowFiles to the downstream relationship. NOTE: The maxvalue.* and fragment.count attributes will not be set on FlowFiles when this property is set.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Maximum Number of Fragments</strong></td><td id="default-value">0</td><td id="allowable-values"></td><td id="description">The maximum number of fragments. If the value specified is zero, then all fragments are returned. This prevents OutOfMemoryError when this
processor ingests huge table. NOTE: Setting this property can result in data loss, as the incoming results are not ordered, and fragments may end at arbitrary boundaries where rows are not included in the result set.<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr><tr><td id="name"><strong>Normalize Table/Column Names</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Whether to change characters in column names when creating the output schema. For example, colons and periods will be changed to underscores.</td></tr><tr><td id="name"><strong>Use Avro Logical Types</strong></td><td id="default-value">false</td><td id="allowable-values"><ul><li>true</li><li>false</li></ul></td><td id="description">Whether to use Avro Logical Types for DECIMAL/NUMBER, DATE, TIME and TIMESTAMP columns. If disabled, written as string. If enabled, Logical typ
es are used and written as its underlying type, specifically, DECIMAL/NUMBER as logical 'decimal': written as bytes with additional precision and scale meta data, DATE as logical 'date-millis': written as int denoting days since Unix epoch (1970-01-01), TIME as logical 'time-millis': written as int denoting milliseconds since Unix epoch, and TIMESTAMP as logical 'timestamp-millis': written as long denoting milliseconds since Unix epoch. If a reader of written Avro records also knows these logical types, then these values can be deserialized with more context depending on reader implementation.</td></tr></table><h3>Dynamic Properties: </h3><p>Dynamic Properties allow the user to specify both the name and value of a property.<table id="dynamic-properties"><tr><th>Name</th><th>Value</th><th>Description</th></tr><tr><td id="name">initial.maxvalue.<max_value_column></td><td id="value">Initial maximum value for the specified column</td><td>Specifies an initial max value for max valu
e column(s). Properties should be added in the format `initial.maxvalue.<max_value_column>`. This value is only used the first time the table is accessed (when a Maximum Value Column is specified).<br/><strong>Supports Expression Language: true (will be evaluated using variable registry only)</strong></td></tr></table></p><h3>Relationships: </h3><table id="relationships"><tr><th>Name</th><th>Description</th></tr><tr><td>success</td><td>Successfully created FlowFile from SQL query result set.</td></tr></table><h3>Reads Attributes: </h3>None specified.<h3>Writes Attributes: </h3><table id="writes-attributes"><tr><th>Name</th><th>Description</th></tr><tr><td>tablename</td><td>Name of the table being queried</td></tr><tr><td>querydbtable.row.count</td><td>The number of rows selected by the query</td></tr><tr><td>fragment.identifier</td><td>If 'Max Rows Per Flow File' is set then all FlowFiles from the same query result set will have the same value for the fragment.identifier attri
bute. This can then be used to correlate the results.</td></tr><tr><td>fragment.count</td><td>If 'Max Rows Per Flow File' is set then this is the total number of FlowFiles produced by a single ResultSet. This can be used in conjunction with the fragment.identifier attribute in order to know how many FlowFiles belonged to the same incoming ResultSet. If Output Batch Size is set, then this attribute will not be populated.</td></tr><tr><td>fragment.index</td><td>If 'Max Rows Per Flow File' is set then the position of this FlowFile in the list of outgoing FlowFiles that were all derived from the same result set FlowFile. This can be used in conjunction with the fragment.identifier attribute to know which FlowFiles originated from the same query result set and in what order FlowFiles were produced</td></tr><tr><td>maxvalue.*</td><td>Each attribute contains the observed maximum value of a specified 'Maximum-value Column'. The suffix of the attribute is the name of the column. If Output
Batch Size is set, then this attribute will not be populated.</td></tr><tr><td>mime.type</td><td>Sets the mime.type attribute to the MIME Type specified by the Record Writer.</td></tr><tr><td>record.count</td><td>The number of records output by the Record Writer.</td></tr></table><h3>State management: </h3><table id="stateful"><tr><th>Scope</th><th>Description</th></tr><tr><td>CLUSTER</td><td>After performing a query on the specified table, the maximum values for the specified column(s) will be retained for use in future executions of the query. This allows the Processor to fetch only those records that have max values greater than the retained values. This can be used for incremental fetching, fetching of newly added rows, etc. To clear the maximum values, clear the state of the processor per the State Management documentation</td></tr></table><h3>Restricted: </h3>This component is not restricted.<h3>Input requirement: </h3>This component does not allow an incoming relationship.<h3
>System Resource Considerations:</h3>None specified.<h3>See Also:</h3><p><a href="../org.apache.nifi.processors.standard.GenerateTableFetch/index.html">GenerateTableFetch</a>, <a href="../org.apache.nifi.processors.standard.ExecuteSQL/index.html">ExecuteSQL</a></p></body></html>
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+<!DOCTYPE html>
+<html lang="en">
+ <!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+ <head>
+ <meta charset="utf-8" />
+ <title>QueryRecord</title>
+
+ <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css" />
+ </head>
+
+ <body>
+ <h3>SQL Over Streams</h3>
+ <p>
+ QueryRecord provides users a tremendous amount of power by leveraging an extremely well-known
+ syntax (SQL) to route, filter, transform, and query data as it traverses the system. In order to
+ provide the Processor with the maximum amount of flexibility, it is configured with a Controller
+ Service that is responsible for reading and parsing the incoming FlowFiles and a Controller Service
+ that is responsible for writing the results out. By using this paradigm, users are not forced to
+ convert their data from one format to another just to query it, and then transform the data back
+ into the form that they want. Rather, the appropriate Controller Service can easily be configured
+ and put to use for the appropriate data format.
+ </p>
+
+ <p>
+ Rather than providing a single "SQL SELECT Statement" type of Property, this Processor makes use
+ of user-defined properties. Each user-defined property that is added to the Processor has a name
+ that becomes a new Relationship for the Processor and a corresponding SQL query that will be evaluated
+ against each FlowFile. This allows multiple SQL queries to be run against each FlowFile.
+ </p>
+
+ <p>
+ The SQL syntax that is supported by this Processor is ANSI SQL and is powered by Apache Calcite. Please
+ note that identifiers are quoted using double-quotes, and column names/labels are case-insensitive.
+ </p>
+
+ <p>
+ As an example, let's consider that we have a FlowFile with the following CSV data:
+ </p>
+ <pre><code>
+ name, age, title
+ John Doe, 34, Software Engineer
+ Jane Doe, 30, Program Manager
+ Jacob Doe, 45, Vice President
+ Janice Doe, 46, Vice President
+ </code></pre>
+
+ <p>
+ Now consider that we add the following properties to the Processor:
+ </p>
+ <table>
+ <tr>
+ <th>Property Name</th>
+ <th>Property Value</th>
+ </tr>
+ <tr>
+ <td>Engineers</td>
+ <td>SELECT * FROM FLOWFILE WHERE title LIKE '%Engineer%'</td>
+ </tr>
+ <tr>
+ <td>VP</td>
+ <td>SELECT name FROM FLOWFILE WHERE title = 'Vice President'</td>
+ </tr>
+ <tr>
+ <td>Younger Than Average</td>
+ <td>SELECT * FROM FLOWFILE WHERE age < (SELECT AVG(age) FROM FLOWFILE)</td>
+ </tr>
+ </table>
+
+ <p>
+ This Processor will now have five relationships: <code>original</code>, <code>failure</code>, <code>Engineers</code>, <code>VP</code>, and <code>Younger Than Average</code>.
+ If there is a failure processing the FlowFile, then the original FlowFile will be routed to <code>failure</code>. Otherwise, the original FlowFile will be routed to <code>original</code>
+ and one FlowFile will be routed to each of the other relationships, with the following values:
+ </p>
+
+ <table>
+ <tr>
+ <th>Relationship Name</th>
+ <th>FlowFile Value</th>
+ </tr>
+ <tr>
+ <td>Engineers</td>
+ <td>
+ <pre><code>
+ name, age, title
+ John Doe, 34, Software Engineer
+ </code></pre>
+ </td>
+ </tr>
+ <tr>
+ <td>VP</td>
+ <td>
+ <pre><code>
+ name
+ Jacob Doe
+ Janice Doe
+ </code></pre>
+ </td>
+ </tr>
+ <tr>
+ <td>Younger Than Average</td>
+ <td>
+ <pre><code>
+ name, age, title
+ John Doe, 34, Software Engineer
+ Jane Doe, 30, Program Manager
+ </code></pre>
+ </td>
+ </tr>
+ </table>
+
+ <p>
+ Note that this example is intended to illustrate the data that is input and output from the Processor. The actual format of the data may vary, depending on the configuration of the
+ Record Reader and Record Writer that is used. For example, here we assume that we are using a CSV Reader and a CSV Writer and that both are configured to have a header line. Should we have
+ used a JSON Writer instead, the output would have contained the same information but been presented in JSON Output. The user is able to choose which input and output format make the most
+ since for his or her use case. The input and output formats need not be the same.
+ </p>
+
+ <p>
+ It is also worth noting that the outbound FlowFiles have two different schemas. The <code>Engineers</code> and <code>Younger Than Average</code> FlowFiles contain 3 fields:
+ <code>name</code>, <code>age</code>, and <code>title</code> while the <code>VP</code> FlowFile contains only the <code>name</code> field. In most cases, the Record Writer is configured to
+ use whatever Schema is provided to it by the Record (this generally means that it is configured with a <code>Schema Access Strategy</code> of <code>Inherit Record Schema</code>). In such
+ a case, this works well. However, if a Schema is supplied to the Record Writer explicitly, it is important to ensure that the Schema accounts for all fields. If not, then then the
+ fields that are missing from the Record Writer's schema will simply not be present in the output.
+ </p>
+
+
+ <h3>SQL Over Hierarchical Data</h3>
+ <p>
+ One important detail that we must taken into account when evaluating SQL over streams of arbitrary data is how
+ we can handle hierarchical data, such as JSON, XML, and Avro. Because SQL was developed originally for relational databases, which
+ represent "flat" data, it is easy to understand how this would map to other "flat" data like a CSV file. Or even
+ a "flat" JSON representation where all fields are primitive types. However, in many cases, users encounter cases where they would like to evaluate SQL
+ over JSON or Avro data that is made up of many nested values. For example, consider the following JSON as input:
+ </p>
+
+ <pre><code>
+ {
+ "name": "John Doe",
+ "title": "Software Engineer",
+ "age": 40,
+ "addresses": [{
+ "streetNumber": 4820,
+ "street": "My Street",
+ "apartment": null,
+ "city": "New York",
+ "state": "NY",
+ "country": "USA",
+ "label": "work"
+ }, {
+ "streetNumber": 327,
+ "street": "Small Street",
+ "apartment": 309,
+ "city": "Los Angeles",
+ "state": "CA",
+ "country": "USA",
+ "label": "home"
+ }],
+ "project": {
+ "name": "Apache NiFi",
+ "maintainer": {
+ "id": 28302873,
+ "name": "Apache Software Foundation"
+ },
+ "debutYear": 2014
+ }
+ }
+ </code></pre>
+
+ <p>
+ Consider a query that will select the title and name of any person who has a home address in a different state
+ than their work address. Here, we can only select the fields <code>name</code>, <code>title</code>,
+ <code>age</code>, and <code>addresses</code>. In this scenario, <code>addresses</code> represents an Array of complex
+ objects - records. In order to accommodate for this, QueryRecord provides User-Defined Functions to enable
+ <a href="../../../../../html/record-path-guide.html">Record Path</a> to be used. Record Path is a simple NiFi Domain Specific Language (DSL)
+ that allows users to reference a nested structure.
+ </p>
+
+ <p>
+ The primary User-Defined Function that will be used is named <code>RPATH</code> (short for Record Path). This function expects exactly two arguments:
+ the Record to evaluate the RecordPath against, and the RecordPath to evaluate (in that order).
+ So, to select the title and name of any person who has a home address in a different state than their work address, we can use
+ the following SQL statement:
+ </p>
+
+ <code><pre>
+ SELECT title, name
+ FROM FLOWFILE
+ WHERE RPATH(addresses, '/state[/label = ''home'']') <>
+ RPATH(addresses, '/state[/label = ''work'']')
+ </pre></code>
+
+ <p>
+ To explain this query in English, we can say that it selects the "title" and "name" fields from any Record in the FlowFile for which there is an address whose "label" is "home" and
+ another address whose "label" is "work" and for which the two addreses have different states.
+ </p>
+
+ <p>
+ Similarly, we could select the entire Record (all fields) of any person who has a "project" whose maintainer is the Apache Software Foundation using the query:
+ </p>
+
+ <code><pre>
+ SELECT *
+ FROM FLOWFILE
+ WHERE RPATH(project, '/maintainer/name') = 'Apache Software Foundation'
+ </pre></code>
+
+ <p>
+ There does exist a caveat, though, when using RecordPath. That is that the <code>RPATH</code> function returns an <code>Object</code>, which in JDBC is represented as an <code>OTHER</code>
+ type. This is fine and does not affect anything when it is used like above. However, what if we wanted to use another SQL function on the result? For example, what if we wanted to use
+ the SQL query <code>SELECT * FROM FLOWFILE WHERE RPATH(project, '/maintainer/name') LIKE 'Apache%'</code>? This would fail with a very long error such as:
+ </p>
+
+ <code><pre>
+3860 [pool-2-thread-1] ERROR org.apache.nifi.processors.standard.QueryRecord - QueryRecord[id=135e9bc8-0372-4c1e-9c82-9d9a5bfe1261] Unable to query FlowFile[0,174730597574853.mockFlowFile,0B] due to java.lang.RuntimeException: Error while compiling generated Java code:
+org.apache.calcite.DataContext root;
+
+public org.apache.calcite.linq4j.Enumerable bind(final org.apache.calcite.DataContext root0) {
+ root = root0;
+ final org.apache.calcite.linq4j.Enumerable _inputEnumerable = ((org.apache.nifi.queryrecord.FlowFileTable) root.getRootSchema().getTable("FLOWFILE")).project(new int[] {
+ 0,
+ 1,
+ 2,
+ 3});
+ return new org.apache.calcite.linq4j.AbstractEnumerable(){
+ public org.apache.calcite.linq4j.Enumerator enumerator() {
+ return new org.apache.calcite.linq4j.Enumerator(){
+ public final org.apache.calcite.linq4j.Enumerator inputEnumerator = _inputEnumerable.enumerator();
+ public void reset() {
+ inputEnumerator.reset();
+ }
+
+ public boolean moveNext() {
+ while (inputEnumerator.moveNext()) {
+ final Object[] inp3_ = (Object[]) ((Object[]) inputEnumerator.current())[3];
+ if (new org.apache.nifi.processors.standard.QueryRecord.ObjectRecordPath().eval(inp3_, "/state[. = 'NY']") != null && org.apache.calcite.runtime.SqlFunctions.like(new org.apache.nifi.processors.standard.QueryRecord.ObjectRecordPath().eval(inp3_, "/state[. = 'NY']"), "N%")) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ public void close() {
+ inputEnumerator.close();
+ }
+
+ public Object current() {
+ final Object[] current = (Object[]) inputEnumerator.current();
+ return new Object[] {
+ current[2],
+ current[0]};
+ }
+
+ };
+ }
+
+ };
+}
+
+
+public Class getElementType() {
+ return java.lang.Object[].class;
+}
+
+
+: java.lang.RuntimeException: Error while compiling generated Java code:
+org.apache.calcite.DataContext root;
+
+public org.apache.calcite.linq4j.Enumerable bind(final org.apache.calcite.DataContext root0) {
+ root = root0;
+ final org.apache.calcite.linq4j.Enumerable _inputEnumerable = ((org.apache.nifi.queryrecord.FlowFileTable) root.getRootSchema().getTable("FLOWFILE")).project(new int[] {
+ 0,
+ 1,
+ 2,
+ 3});
+ return new org.apache.calcite.linq4j.AbstractEnumerable(){
+ public org.apache.calcite.linq4j.Enumerator enumerator() {
+ return new org.apache.calcite.linq4j.Enumerator(){
+ public final org.apache.calcite.linq4j.Enumerator inputEnumerator = _inputEnumerable.enumerator();
+ public void reset() {
+ inputEnumerator.reset();
+ }
+
+ public boolean moveNext() {
+ while (inputEnumerator.moveNext()) {
+ final Object[] inp3_ = (Object[]) ((Object[]) inputEnumerator.current())[3];
+ if (new org.apache.nifi.processors.standard.QueryRecord.ObjectRecordPath().eval(inp3_, "/state[. = 'NY']") != null && org.apache.calcite.runtime.SqlFunctions.like(new org.apache.nifi.processors.standard.QueryRecord.ObjectRecordPath().eval(inp3_, "/state[. = 'NY']"), "N%")) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ public void close() {
+ inputEnumerator.close();
+ }
+
+ public Object current() {
+ final Object[] current = (Object[]) inputEnumerator.current();
+ return new Object[] {
+ current[2],
+ current[0]};
+ }
+
+ };
+ }
+
+ };
+}
+
+
+public Class getElementType() {
+ return java.lang.Object[].class;
+}
+
+
+
+3864 [pool-2-thread-1] ERROR org.apache.nifi.processors.standard.QueryRecord -
+java.lang.RuntimeException: Error while compiling generated Java code:
+org.apache.calcite.DataContext root;
+
+public org.apache.calcite.linq4j.Enumerable bind(final org.apache.calcite.DataContext root0) {
+ root = root0;
+ final org.apache.calcite.linq4j.Enumerable _inputEnumerable = ((org.apache.nifi.queryrecord.FlowFileTable) root.getRootSchema().getTable("FLOWFILE")).project(new int[] {
+ 0,
+ 1,
+ 2,
+ 3});
+ return new org.apache.calcite.linq4j.AbstractEnumerable(){
+ public org.apache.calcite.linq4j.Enumerator enumerator() {
+ return new org.apache.calcite.linq4j.Enumerator(){
+ public final org.apache.calcite.linq4j.Enumerator inputEnumerator = _inputEnumerable.enumerator();
+ public void reset() {
+ inputEnumerator.reset();
+ }
+
+ public boolean moveNext() {
+ while (inputEnumerator.moveNext()) {
+ final Object[] inp3_ = (Object[]) ((Object[]) inputEnumerator.current())[3];
+ if (new org.apache.nifi.processors.standard.QueryRecord.ObjectRecordPath().eval(inp3_, "/state[. = 'NY']") != null && org.apache.calcite.runtime.SqlFunctions.like(new org.apache.nifi.processors.standard.QueryRecord.ObjectRecordPath().eval(inp3_, "/state[. = 'NY']"), "N%")) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ public void close() {
+ inputEnumerator.close();
+ }
+
+ public Object current() {
+ final Object[] current = (Object[]) inputEnumerator.current();
+ return new Object[] {
+ current[2],
+ current[0]};
+ }
+
+ };
+ }
+
+ };
+}
+
+
+public Class getElementType() {
+ return java.lang.Object[].class;
+}
+
+
+
+ at org.apache.calcite.avatica.Helper.wrap(Helper.java:37)
+ at org.apache.calcite.adapter.enumerable.EnumerableInterpretable.toBindable(EnumerableInterpretable.java:108)
+ at org.apache.calcite.prepare.CalcitePrepareImpl$CalcitePreparingStmt.implement(CalcitePrepareImpl.java:1237)
+ at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:331)
+ at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:230)
+ at org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:772)
+ at org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:636)
+ at org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:606)
+ at org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:229)
+ at org.apache.calcite.jdbc.CalciteConnectionImpl.prepareStatement_(CalciteConnectionImpl.java:211)
+ at org.apache.calcite.jdbc.CalciteConnectionImpl.prepareStatement(CalciteConnectionImpl.java:200)
+ at org.apache.calcite.jdbc.CalciteConnectionImpl.prepareStatement(CalciteConnectionImpl.java:90)
+ at org.apache.calcite.avatica.AvaticaConnection.prepareStatement(AvaticaConnection.java:175)
+ at org.apache.nifi.processors.standard.QueryRecord.buildCachedStatement(QueryRecord.java:428)
+ at org.apache.nifi.processors.standard.QueryRecord.getStatement(QueryRecord.java:415)
+ at org.apache.nifi.processors.standard.QueryRecord.queryWithCache(QueryRecord.java:475)
+ at org.apache.nifi.processors.standard.QueryRecord.onTrigger(QueryRecord.java:311)
+ at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
+ at org.apache.nifi.util.StandardProcessorTestRunner$RunProcessor.call(StandardProcessorTestRunner.java:255)
+ at org.apache.nifi.util.StandardProcessorTestRunner$RunProcessor.call(StandardProcessorTestRunner.java:249)
+ at java.util.concurrent.FutureTask.run(FutureTask.java:266)
+ at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
+ at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
+ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
+ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
+ at java.lang.Thread.run(Thread.java:745)
+Caused by: org.codehaus.commons.compiler.CompileException: Line 21, Column 180: No applicable constructor/method found for actual parameters "java.lang.Object, java.lang.String"; candidates are: "public static boolean org.apache.calcite.runtime.SqlFunctions.like(java.lang.String, java.lang.String)", "public static boolean org.apache.calcite.runtime.SqlFunctions.like(java.lang.String, java.lang.String, java.lang.String)"
+ at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:10092)
+ at org.codehaus.janino.UnitCompiler.findMostSpecificIInvocable(UnitCompiler.java:7506)
+ at org.codehaus.janino.UnitCompiler.findIMethod(UnitCompiler.java:7376)
+ at org.codehaus.janino.UnitCompiler.findIMethod(UnitCompiler.java:7280)
+ at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:3850)
+ at org.codehaus.janino.UnitCompiler.access$6900(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$10.visitMethodInvocation(UnitCompiler.java:3251)
+ at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:3974)
+ at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:3278)
+ at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:4345)
+ at org.codehaus.janino.UnitCompiler.compileBoolean2(UnitCompiler.java:2842)
+ at org.codehaus.janino.UnitCompiler.access$4800(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$8.visitMethodInvocation(UnitCompiler.java:2803)
+ at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:3974)
+ at org.codehaus.janino.UnitCompiler.compileBoolean(UnitCompiler.java:2830)
+ at org.codehaus.janino.UnitCompiler.compileBoolean2(UnitCompiler.java:2924)
+ at org.codehaus.janino.UnitCompiler.access$5000(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$8.visitBinaryOperation(UnitCompiler.java:2797)
+ at org.codehaus.janino.Java$BinaryOperation.accept(Java.java:3768)
+ at org.codehaus.janino.UnitCompiler.compileBoolean(UnitCompiler.java:2830)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1742)
+ at org.codehaus.janino.UnitCompiler.access$1200(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$4.visitIfStatement(UnitCompiler.java:935)
+ at org.codehaus.janino.Java$IfStatement.accept(Java.java:2157)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:956)
+ at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:997)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:983)
+ at org.codehaus.janino.UnitCompiler.access$1000(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$4.visitBlock(UnitCompiler.java:933)
+ at org.codehaus.janino.Java$Block.accept(Java.java:2012)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:956)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1263)
+ at org.codehaus.janino.UnitCompiler.access$1500(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$4.visitWhileStatement(UnitCompiler.java:938)
+ at org.codehaus.janino.Java$WhileStatement.accept(Java.java:2244)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:956)
+ at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:997)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2283)
+ at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:820)
+ at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:792)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:505)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:656)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:620)
+ at org.codehaus.janino.UnitCompiler.access$200(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$2.visitAnonymousClassDeclaration(UnitCompiler.java:343)
+ at org.codehaus.janino.Java$AnonymousClassDeclaration.accept(Java.java:894)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:352)
+ at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:4194)
+ at org.codehaus.janino.UnitCompiler.access$7300(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$10.visitNewAnonymousClassInstance(UnitCompiler.java:3260)
+ at org.codehaus.janino.Java$NewAnonymousClassInstance.accept(Java.java:4131)
+ at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:3278)
+ at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:4345)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1901)
+ at org.codehaus.janino.UnitCompiler.access$2100(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$4.visitReturnStatement(UnitCompiler.java:944)
+ at org.codehaus.janino.Java$ReturnStatement.accept(Java.java:2544)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:956)
+ at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:997)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2283)
+ at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:820)
+ at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:792)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:505)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:656)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:620)
+ at org.codehaus.janino.UnitCompiler.access$200(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$2.visitAnonymousClassDeclaration(UnitCompiler.java:343)
+ at org.codehaus.janino.Java$AnonymousClassDeclaration.accept(Java.java:894)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:352)
+ at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:4194)
+ at org.codehaus.janino.UnitCompiler.access$7300(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$10.visitNewAnonymousClassInstance(UnitCompiler.java:3260)
+ at org.codehaus.janino.Java$NewAnonymousClassInstance.accept(Java.java:4131)
+ at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:3278)
+ at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:4345)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1901)
+ at org.codehaus.janino.UnitCompiler.access$2100(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$4.visitReturnStatement(UnitCompiler.java:944)
+ at org.codehaus.janino.Java$ReturnStatement.accept(Java.java:2544)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:956)
+ at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:997)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2283)
+ at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:820)
+ at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:792)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:505)
+ at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:391)
+ at org.codehaus.janino.UnitCompiler.access$400(UnitCompiler.java:183)
+ at org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:345)
+ at org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:1139)
+ at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:352)
+ at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:320)
+ at org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:383)
+ at org.codehaus.janino.ClassBodyEvaluator.compileToClass(ClassBodyEvaluator.java:315)
+ at org.codehaus.janino.ClassBodyEvaluator.cook(ClassBodyEvaluator.java:233)
+ at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:192)
+ at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:47)
+ at org.codehaus.janino.ClassBodyEvaluator.createInstance(ClassBodyEvaluator.java:340)
+ at org.apache.calcite.adapter.enumerable.EnumerableInterpretable.getBindable(EnumerableInterpretable.java:140)
+ at org.apache.calcite.adapter.enumerable.EnumerableInterpretable.toBindable(EnumerableInterpretable.java:105)
+ ... 24 common frames omitted
+ </pre></code>
+
+ <p>
+ This happens because the <code>LIKE</code> function expects that you use it to compare <code>String</code> objects. I.e., it expects a format of <code>String LIKE String</code>
+ and we have instead passed to it <code>Other LIKE String</code>. To account for this, there exact a few other RecordPath functions: <code>RPATH_STRING</code>, <code>RPATH_INT</code>,
+ <code>RPATH_LONG</code>, <code>RPATH_FLOAT</code>, and <code>RPATH_DOUBLE</code> that can be used when you want to cause the return type to be of type <code>String</code>,
+ <code>Integer</code>, <code>Long</code> (64-bit Integer), <code>Float</code>, or <code>Double</code>, respectively. So the above query would need to instead be written as
+ <code>SELECT * FROM FLOWFILE WHERE RPATH_STRING(project, '/maintainer/name') LIKE 'Apache%'</code>, which will produce the desired output.
+ </p>
+
+
+ <h3>Aggregate Functions</h3>
+ <p>
+ In order to evaluate SQL against a stream of data, the Processor treats each individual FlowFile as its own
+ Table. Therefore, aggregate functions such as SUM and AVG will be evaluated against all Records in each FlowFile
+ but will not span FlowFile boundaries. As an example, consider an input FlowFile in CSV format with the following
+ data:
+ </p>
+
+ <pre><code>
+name, age, gender
+John Doe, 40, Male
+Jane Doe, 39, Female
+Jimmy Doe, 4, Male
+June Doe, 1, Female
+ </code></pre>
+
+ <p>
+ Given this data, we may wish to perform a query that performs an aggregate function, such as MAX:
+ </p>
+
+ <pre><code>
+ SELECT name
+ FROM FLOWFILE
+ WHERE age = (
+ SELECT MAX(age)
+ )
+ </code></pre>
+
+ <p>
+ The above query will select the name of the oldest person, namely John Doe. If a second FlowFile were to then arrive,
+ its contents would be evaluated as an entirely new Table.
+ </p>
+
+ </body>
+</html>
\ No newline at end of file