[jira] [Commented] (DRILL-423) Need a C++ client for Drill

["George Chow (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13970475#comment-13970475 ] 

George Chow commented on DRILL-423:
-----------------------------------

According to Mehant, there is no such type as DATETIME, just TIMESTAMP.


> Need a C++ client for Drill
> ---------------------------
>
>                 Key: DRILL-423
>                 URL: https://issues.apache.org/jira/browse/DRILL-423
>             Project: Apache Drill
>          Issue Type: New Feature
>            Reporter: Parth Chandra
>
> WE need a C++ client for drill that can be used to write an ODBC driver. 
> The API should include 
> 1) Connect
> 2) Handshake
> 3) Execute Query
> 4) Fetch Results 
> The API needs to provide interfaces to decode the RPC messages into RecordBatches and ValueVectors and provide accessors to get values from ValueVectors.
> Initial implementation of the  ValueVectors interface will probably not support mutators for ValueVectors.
> Not all datatypes will be supported. In particular MAP and REPEATMAP will not be supported. Nullable and repeat types will be supported. The following is the list of datatypes for which support is planned -
>     TINYINT = 3;   //  single byte signed integer
>     SMALLINT = 4;   //  two byte signed integer
>     INT = 5;   //  four byte signed integer
>     BIGINT = 6;   //  eight byte signed integer
>     DECIMAL4 = 7;   //  a decimal supporting precision between 1 and 8 (4 bits for decimal location, 1 sign)
>     DECIMAL8 = 8;   //  a decimal supporting precision between 9 and 18 (5 bits for decimal location, 1 sign)
>     DECIMAL12 = 9;   //  a decimal supporting precision between 19 and 28 (5 bits for decimal location, 1 sign)
>     DECIMAL16 = 10;   //  a decimal supporting precision between 29 and 37 (6 bits for decimal location, 1 sign)
>     MONEY = 11;   //  signed decimal with two digit precision
>     DATE = 12;   //  days since 4713bc 
>     TIME = 13;   //  time in micros before or after 2000/1/1
>     TIMETZ = 14;   //  time in micros before or after 2000/1/1 with timezone
>     TIMESTAMP = 15;   //  unix epoch time in millis
>     DATETIME = 16;   //  TBD
>     INTERVAL = 17;   //  TBD
>     FLOAT4 = 18;   //  4 byte ieee 754 
>     FLOAT8 = 19;   //  8 byte ieee 754
>     BIT = 20;   //  single bit value (boolean)
>     FIXEDCHAR = 21;   //  utf8 fixed length string, padded with spaces
>     FIXED16CHAR = 22;
>     FIXEDBINARY = 23;   //  fixed length binary, padded with 0 bytes
>     VARCHAR = 24;   //  utf8 variable length string
>     VAR16CHAR = 25; // utf16 variable length string
>     VARBINARY = 26;   //  variable length binary
>     UINT1 = 29;   //  unsigned 1 byte integer
>     UINT2 = 30;   //  unsigned 2 byte integer
>     UINT4 = 31;   //  unsigned 4 byte integer
>     UINT8 = 32;   //  unsigned 8 byte integer



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