feat(columnar_map): SPI and data model for COLUMNAR_MAP index#18368

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tarun11Mavani wants to merge 11 commits intoapache:masterfrom

tarun11Mavani:columnar-map-v2-spi

Commits on Apr 30, 2026

refactor(map): rename maxKeys -> maxDenseKeys for clarity in ColumnarMapIndexConfig and usages
tarun11Mavani
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fix(map): fix childFieldSpecs wire-compat and scope \$__ check to COLUMNAR_MAP

tarun11Mavani
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claude
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