Peter Rozsa created IMPALA-13357:
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             Summary: REGEXP_REPLACE swallows the first backslash from escaped 
strings
                 Key: IMPALA-13357
                 URL: https://issues.apache.org/jira/browse/IMPALA-13357
             Project: IMPALA
          Issue Type: Bug
            Reporter: Peter Rozsa


Example: select regexp_replace('a\\b', '\\+', ''); 

Output: a\b (the shell interprets the first \)

Expected output: ab

 
getUnescapedValue() in StringLiteral uses MetastoreShim.unescapeSQLString which 
removes the first backslash from the pattern



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