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Posted to issues@spark.apache.org by "Eric Liang (JIRA)" <ji...@apache.org> on 2017/04/24 19:26:04 UTC

[jira] [Created] (SPARK-20450) Unexpected first-query schema inference cost with 2.1.1 RC

Eric Liang created SPARK-20450:
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             Summary: Unexpected first-query schema inference cost with 2.1.1 RC
                 Key: SPARK-20450
                 URL: https://issues.apache.org/jira/browse/SPARK-20450
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.1.1
            Reporter: Eric Liang
            Priority: Blocker


https://issues.apache.org/jira/browse/SPARK-19611 fixes a regression from 2.0 where Spark silently fails to read case-sensitive fields missing a case-sensitive schema in the table properties. The fix is to detect this situation, infer the schema, and write the case-sensitive schema into the metastore.

However this can incur an unexpected performance hit the first time such a problematic table is queried (and there is a high false-positive rate here since most tables don't actually have case-sensitive fields).



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