marko-sisovic-db opened a new pull request, #53308:
URL: https://github.com/apache/spark/pull/53308
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### What changes were proposed in this pull request?
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Passing `CaseInsensitiveMap` to `dialect.beforeFetch` in `JDBCRDD`. [Spark
docs](https://spark.apache.org/docs/latest/sql-data-sources-jdbc.html#data-source-option)
state that options are case insensitive, so this will make it easier for
dialects to respect that. Even if we have some edge case where we need the
original casing, we can access that by upcasting/pattern matching to
`CaseInsensitiveMap`, for which we have access to original casing through it's
member method `toMap`:
https://github.com/apache/spark/blob/415f50511463a8e73af77cf9f70cba4292c1331d/sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/CaseInsensitiveMap.scala#L56
### Why are the changes needed?
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The option `fetchsize` requires another option, `autocommit` to be set to
`false` for the Postgres connector. We have logic for this:
https://github.com/apache/spark/blob/415f50511463a8e73af77cf9f70cba4292c1331d/sql/core/src/main/scala/org/apache/spark/sql/jdbc/PostgresDialect.scala#L203-L205
However, this logic is case-sensitive, and will only work for lowercased
`fetchsize`. When passing `fetchSize` for example, the correct value for the
fetchsize will be set on the Postgres driver, but it won't have `autocommit ->
false`, so the fetch size will be ignored.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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New test: `PostgresDialectSuite`.
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Yes, partly generated-by: claude code.
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