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CA Rearrange plpgsql parsing to simplify and speed it up a bit. · postgrespro/postgres@f2b7692 · GitHub
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Rearrange plpgsql parsing to simplify and speed it up a bit.
* Pull the responsibility for %TYPE and %ROWTYPE out of the scanner, letting read_datatype manage it instead. * Avoid unnecessary scanner-driven lookups of plpgsql variables in places where it's not needed, which is actually most of the time; we do not need it in DECLARE sections nor in text that is a SQL query or expression. * Rationalize the set of token types returned by the scanner: distinguishing T_SCALAR, T_RECORD, T_ROW seems to complicate the grammar in more places than it simplifies it, so merge these into one token type T_DATUM; but split T_ERROR into T_DBLWORD and T_TRIPWORD for clarity and simplicity of later processing. Some of this will need to be revisited again when we try to make plpgsql use the core scanner, but this patch gets some of the bigger stumbling blocks out of the way.
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