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The point of this change is to use %pure-parser in pgbench's exprparse.y. The immediate reason is that it turns out very ancient versions of bison have a bug with the combination of a reentrant lexer and non-reentrant parser. We could consider dropping support for such ancient bisons; but considering that we might well need exprparse.y to be reentrant some day, it seems better to make it so right now than to move the portability goalposts. (AFAICT there's no particular performance consequence to this change, either, so there's no good reason not to do it.) Now, %pure-parser assumes that the called lexer is built with %option bison-bridge. Because we're assuming bitwise compatibility of yyscan_t (yyguts_t) data structures among all the psql/pgbench lexers, that requirement propagates back to psql's lexers as well. But it's just a few lines of change on that side too; and if psqlscan.l is to set the baseline for a possibly-large family of lexers, it should err on the side of including not omitting useful features. |
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