Support `multisearch` command in calcite#4332

Merged

RyanL1997 merged 38 commits intoopensearch-project:mainfrom

ahkcs:feat/multisearch_cmd

Oct 2, 2025

Commits on Oct 1, 2025

Initial implementation for multisearch command
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timestamp interleaving
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removal
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update test
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fix tests
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remove streaming command
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update doctest
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fix doctest
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add CalciteExplainIT
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formatting
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Anonymizer test
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fixes
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removal
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update explainIT
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fix test
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fix anonymizerTest
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fixes
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update grammar
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update explainIT
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update error handling
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update explainIT to use yaml
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removal
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add schema null filling test cases
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make @timestamp priority timestamp
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fix
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fixes
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fix test
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update doc
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fix IT
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doc
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remove duplication handling logic
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better formatting
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fixes
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CI
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fix explainIT
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Extract SchemaUnifier
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trim doctest dataset
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remove template change
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