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Posted to issues@drill.apache.org by "Jacques Nadeau (JIRA)" <ji...@apache.org> on 2015/01/04 22:27:41 UTC
[jira] [Updated] (DRILL-798) explicit casting a string to float
loses precision
[ https://issues.apache.org/jira/browse/DRILL-798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jacques Nadeau updated DRILL-798:
---------------------------------
Fix Version/s: (was: Future)
0.9.0
Priority: Critical (was: Major)
> explicit casting a string to float loses precision
> --------------------------------------------------
>
> Key: DRILL-798
> URL: https://issues.apache.org/jira/browse/DRILL-798
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Reporter: Chun Chang
> Assignee: Mehant Baid
> Priority: Critical
> Fix For: 0.9.0
>
>
> This is tested on git.commit.id.abbrev=5d7e3d3
> Consider the following query which cast a string '999999999' into float. This yielded 1.0e9 with drill which doesn't look right.
> 0: jdbc:drill:schema=dfs> select cast('999999999' as float) from data limit 1;
> +------------+
> | EXPR$0 |
> +------------+
> | 1.0E9 |
> +------------+
> 0: jdbc:drill:schema=dfs> explain plan for select cast('999999999' as float) from data limit 1;
> +------------+------------+
> | text | json |
> +------------+------------+
> | ScreenPrel
> SelectionVectorRemoverPrel
> LimitPrel(fetch=[1])
> ProjectPrel(EXPR$0=[CAST('999999999'):FLOAT NOT NULL])
> ScanPrel(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=maprfs:/user/root/mondrian/data]], selectionRoot=/user/root/mondrian/data, columns=null]])
> | {
> "head" : {
> "version" : 1,
> "generator" : {
> "type" : "ExplainHandler",
> "info" : ""
> },
> "type" : "APACHE_DRILL_PHYSICAL",
> "options" : [ ],
> "resultMode" : "EXEC"
> },
> "graph" : [ {
> "pop" : "parquet-scan",
> "@id" : 1,
> "entries" : [ {
> "path" : "maprfs:/user/root/mondrian/data"
> } ],
> "storage" : {
> "type" : "file",
> "connection" : "maprfs:///",
> "workspaces" : {
> "default" : {
> "location" : "/user/root/mondrian/",
> "writable" : false,
> "storageformat" : null
> },
> "home" : {
> "location" : "/",
> "writable" : false,
> "storageformat" : null
> },
> "root" : {
> "location" : "/",
> "writable" : false,
> "storageformat" : null
> },
> "tmp" : {
> "location" : "/tmp",
> "writable" : true,
> "storageformat" : "csv"
> }
> },
> "formats" : {
> "psv" : {
> "type" : "text",
> "extensions" : [ "tbl" ],
> "delimiter" : "|"
> },
> "csv" : {
> "type" : "text",
> "extensions" : [ "csv" ],
> "delimiter" : ","
> },
> "tsv" : {
> "type" : "text",
> "extensions" : [ "tsv" ],
> "delimiter" : "\t"
> },
> "parquet" : {
> "type" : "parquet"
> },
> "json" : {
> "type" : "json"
> }
> }
> },
> "format" : {
> "type" : "parquet"
> },
> "selectionRoot" : "/user/root/mondrian/data"
> }, {
> "pop" : "project",
> "@id" : 2,
> "exprs" : [ {
> "ref" : "`EXPR$0`",
> "expr" : "cast( ('999999999' ) as FLOAT4 )"
> } ],
> "child" : 1,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000
> }, {
> "pop" : "limit",
> "@id" : 3,
> "child" : 2,
> "first" : 0,
> "last" : 1,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000
> }, {
> "pop" : "selection-vector-remover",
> "@id" : 4,
> "child" : 3,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000
> }, {
> "pop" : "screen",
> "@id" : 5,
> "child" : 4,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000
> } ]
> } |
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