Fix #14545 - pivot header must be defined in the grammar #14556
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Fix duckdb/duckdb#14545 - pivot header must be defined in the grammar (duckdb/duckdb#14556)
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Fix duckdb/duckdb#14545 - pivot header must be defined in the grammar (duckdb/duckdb#14556) Co-authored-by: krlmlr <krlmlr@users.noreply.github.com>
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Fix #14545
Yacc "helpfully" allows you to accidentally define an empty token, which defaults to returning nothing, in the following way:
This PR fixes the issue and makes the query return a syntax error (as it should).