Add MERGE INTO types to datafusion-expr#20763
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Add new types to support MERGE INTO DML statements: - MergeIntoOp: Carries ON condition and WHEN clauses - MergeIntoClause: Single WHEN clause (kind, predicate, action) - MergeIntoClauseKind: Matched/NotMatched/NotMatchedByTarget/NotMatchedBySource - MergeIntoAction: Update/Insert/Delete actions Add WriteOp::MergeInto variant to WriteOp enum.
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Which issue does this PR close?
The task 1 of #20746
Rationale for this change
support MERGE INTO DML statements in the datafusion-expr
What changes are included in this PR?
Add new types to support MERGE INTO DML statements
Add WriteOp::MergeInto variant to WriteOp enum.
Are these changes tested?
Unit Test