babelfish-for-postgresql / babelfish_extensions / 13781055499

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Fix ANTLR query mutator sanity check condition (#3562)

The original sanity check in the query mutator (offset - cursor < 0) was
ineffective due to unsigned integer arithmetic. This commit replaces it
with a correct condition (offset < cursor) to properly detect multiple
mutations on the same position.

Task: BABEL-5201

Signed-off-by: Roshan Kanwar <rskanwar@amazon.com>

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