babelfish-for-postgresql / babelfish_extensions / 15531221306

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Fix invalid read in tsql_round_var function (#3720)

To detect for overflow and underflow we need to determine total integral digits which in-turn uses leading digits in the digits array. But digits array will be empty in case of 0 numeric values which leads to invalid read.
When the rscale is negative and numeric value is 0 we can skip checking for numeric overflow as the base-NBASE digits will be empty for 0.

Task: BABEL-5546

Signed-off-by: Sharath BP <sharatbp@amazon.com>

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