[SPARK-19335][SPARK-38200][SQL] Add upserts for writing to JDBC#54449
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EnricoMi wants to merge 15 commits intoapache:masterfrom
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[SPARK-19335][SPARK-38200][SQL] Add upserts for writing to JDBC#54449EnricoMi wants to merge 15 commits intoapache:masterfrom
EnricoMi wants to merge 15 commits intoapache:masterfrom
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- Use SparkUnsupportedOperationException - Remove unused string interpolation - Fix indentation
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What changes were proposed in this pull request?
This is a follow-up on #16685 and #16692.
Implements upsert mode for
SaveMode.Appendof the MySql, MsSql, and Postgres JDBC source.See #41611 for an alternative using the
MERGE INTOcommand (not supported by MySql).Why are the changes needed?
The JDBC writer only supports either truncating the existing table or inserting. Duplicates, i.e. rows with identical values in the primary or unique index columns, cause an exception, permitting updating existing and inserting new rows.
Re-evaluating a partition due to executor loss will insert rows that have been inserted in an earlier attempt, which kills the entier Spark job.
Does this PR introduce any user-facing change?
This adds
upsertandupsertKeyColumnsoptions forSaveMode.Appendof the JDBC source.How was this patch tested?
Tests in
JdbcSuiteand integration suites.Re-opens #49528.