feat(executor): implement LENGTH [CLAUDE] - #8145
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LENGTH was absent from the executor's ENV, so any query calling it raised `name 'LENGTH' is not defined` rather than answering. char_length() parses to the same node, so it was unavailable too. null_if_any(len) matches Postgres on all three cases: 3 for 'abc', 0 for the empty string, and NULL for NULL.
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LENGTHis absent from the executor'sENV, so any query calling it raises rather than answering:char_length()parses to the same node, so it was unavailable too.null_if_any(len)matches Postgres on all three cases — checked against a real PostgreSQL 18:One line, plus a test covering both spellings. Full suite: 1318 tests, OK.