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Posted to dev@hive.apache.org by "jiraposter@reviews.apache.org (Commented) (JIRA)" <ji...@apache.org> on 2011/10/21 01:04:12 UTC
[jira] [Commented] (HIVE-727) Hive Server getSchema() returns wrong
schema for "Explain" queries
[ https://issues.apache.org/jira/browse/HIVE-727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132172#comment-13132172 ]
jiraposter@reviews.apache.org commented on HIVE-727:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2517/
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Review request for hive and Carl Steinbach.
Summary
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Added a method to get result schema from a Task. The ExplainSemanticAnalyzer invokes this to get the schema for explain statement which is a single string column.
This addresses bug Hive-727.
https://issues.apache.org/jira/browse/Hive-727
Diffs
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jdbc/src/test/org/apache/hadoop/hive/jdbc/TestJdbcDriver.java 4972754
ql/src/java/org/apache/hadoop/hive/ql/exec/ExplainTask.java fe95cb1
ql/src/java/org/apache/hadoop/hive/ql/exec/Task.java 41d2a81
ql/src/java/org/apache/hadoop/hive/ql/parse/ExplainSemanticAnalyzer.java fc22535
Diff: https://reviews.apache.org/r/2517/diff
Testing
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Added a new test case in TestJdbcDriver to run explain statement and verify resultset metadata
Thanks,
Prasad
> Hive Server getSchema() returns wrong schema for "Explain" queries
> ------------------------------------------------------------------
>
> Key: HIVE-727
> URL: https://issues.apache.org/jira/browse/HIVE-727
> Project: Hive
> Issue Type: Bug
> Reporter: Eric Hwang
> Attachments: Hive-727.patch
>
>
> The Hive Server's getSchema() function will return a schema with zero fields when executing an "Explain..." query. A quick fix might be to set the default schema to be exactly one column of type string.
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