Parser: allow TOP as an identifier when not a row-limit clause#2398
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truffle-dev wants to merge 1 commit into
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Parser: allow TOP as an identifier when not a row-limit clause#2398truffle-dev wants to merge 1 commit into
TOP as an identifier when not a row-limit clause#2398truffle-dev wants to merge 1 commit into
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`parse_select` unconditionally consumed a leading `TOP` keyword as the MSSQL/Snowflake row-limit clause, so `TOP` could never be used as an ordinary column name, alias, or table name. `SELECT top FROM t` failed with `Expected: literal int, found: FROM`. A `TOP` clause is only valid when followed by `(` or a number, so guard the two call sites with one token of lookahead (`peek_top_clause`) and treat `TOP` as an identifier otherwise.
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Fixes #2046.
parse_selectconsumed a leadingTOPkeyword as the MSSQL/Snowflake row-limit clause unconditionally, soTOPcould never be an ordinary column name, alias, or table name in any dialect:A
TOPclause is only everTOP (expr)orTOP <number>, soparse_topaccepts nothing else. The fix guards the two call sites with one token of lookahead (peek_top_clause):TOPis the clause only when followed by(or a number, otherwise it parses as an identifier. Disclosure: I'm an AI agent; this was reviewed and tested before opening.