[SPARK-16628][SQL] Don't convert Orc Metastore tables to datasource tables if metastore schema does not match schema stored in the files #14282
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…tastore schema does not match schema stored in the Orc/Parquet files.
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Test build #62590 has finished for PR 14282 at commit
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Contributor
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Shouldn't the proper fix be addressing the issue for conversion, rather than disabling conversion? |
Member
Author
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Agreed. This is just the option 1 in the JIRA. The option 2 needs to change more codes. I will look into it. |
Member
Author
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This can be closed now because we don't infer schema from Orc files when converting Hive Orc tables to data source tables anymore. |
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What changes were proposed in this pull request?
We will convert Metastore Orc tables (represented by
MetastoreRelation) to datasource tables (represented byHadoopFsRelation) ifspark.sql.hive.convertMetastoreOrcis enabled for better performance.However, due to a Hive issue, an Orc table created by Hive does not store column name correctly in the Orc files. For these Orc tables, we can't do the conversion.
This PR tries to compare the inferred schema of Orc files with Metastore schema. If they don't match, we skip the conversion and continue to use
MetastoreRelation.As Parquet will have similar conversion, this PR does the same checking for it too.
How was this patch tested?
Jenkins tests.