[SPARK-53718][SQL] Add a new Optimizer rule to flatten nested MapConcat expressions #52469
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What changes were proposed in this pull request?
Add a new Optimizer rule to flatten nested MapConcat expressions in two ways:
1.Flattens nested MapConcat expressions into a single MapConcat.
Example:
map_concat(map('a', 'a1'), map_concat(map('b', 'b1'), map('c', 'c1'))) → map_concat(map('a', 'a1'), map('b', 'b1'), map('c', 'c1'))2.Extracts the child directly when MapConcat has only one child
Example:
map_concat(map('a', 'a1')) → map('a', 'a1')Does this PR introduce any user-facing change?
No.
How was this patch tested?
SQLQueryTestSuite and CombineMapConcatsSuite.
Was this patch authored or co-authored using generative AI tooling?
No.