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Exclude composite BTree files before scalar reader selection and coverage calculation. Preserve usable single-column indexes and existing search-mode fallback behavior, avoiding grouping failures and missing NULL matches. Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
Python admitted composite BTree indexes as scalar indexes, causing grouping failures when single-column indexes coexist and missing NULL matches through incorrect coverage.
Exclude unsupported composite BTree files from both reader selection and coverage, preserving usable single-column indexes, full/detail fallback, and existing fast-mode behavior.
Tests