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  1. MariaDB Server
  2. MDEV-29095

REGEXP_REPLACE treats empty strings different than REPLACE in ORACLE mode

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    Description

      The REPLACE function has special treatment for cases where the 3rd parameter is NULL in ORACLE sql_mode, REGEXP_REPLACE on the other hand always returns NULL when the 3rd parameter is NULL, or an empty string converted to NULL due to empty_string_is_null sql_mode.

      When calling both functions with parameters ('x-x', '-', empty string or NULL) the results are as follows

      3rd param  REPLACE  REGEXP_REPLACE  sql_mode
      		 
      ---------------------------------------------------------------
      		 
      ''           xx           xx        ORACLE
      		 
      NULL         xx          NULL       ORACLE
      		 
      ''           xx          NULL       ORACLE,empty_string_is_null
      		 
      NULL         xx          NULL       ORACLE,empty_string_is_null

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          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27744 LPAD in vcol created in ORACLE mode makes table corrupted in non-ORACLE

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          relates to

          Task - A task that needs to be done. MDEV-13003 Oracle compatibility : Replace function (PR: #401)

          • Major - Major loss of function.
          • Closed

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            Stalled Closed
            		12h 24m 1

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              bar Alexander Barkov
              hholzgra Hartmut Holzgraefe
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                Updated:
                Resolved:

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