babelfish-for-postgresql / babelfish_extensions / 9995876795

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Fix crash issue in pre transforming column name (#2750)

Fix the crash happen when column ref is followed by a comment without
space like : 'SELECT table1.c2--table1.REPGETTEXT('.

Previously, the column transform didn't consider '--' will directly
followed with column ref and will wrongly regard the comment part
as the column ref, thus will cause crash later in finding the column name.

This fix add the check for '--' at the end of column def in the sql string to avoid this crash.

Task: BABEL-5070
Signed-off-by: Zhibai Song <szh@amazon.com>

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