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ecpg: Catch zero-length Unicode identifiers correctly

Peter Eisentraut <peter@eisentraut.org>

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Commit: a18b6d2dc288dfa6e7905ede1d4462edd6a8af47
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-01-12T09:39:57Z
Releases: 15.0 
ecpg: Catch zero-length Unicode identifiers correctly

The previous code to detect a zero-length identifier when using
Unicode identifiers such as

exec sql select u&"";

did not work.  This fixes that.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/82fafa79-331c-9d65-e51b-8b5d1b2383fc%40enterprisedb.com

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src/interfaces/ecpg/preproc/pgc.l modified +1 −1

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