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  1. MariaDB Server
  2. MDEV-17661

Add sql_mode specific tokens for the keyword DECODE

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Details

    • Task
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.3.11
    • Parser
    • None

    Description

      DECODE has different meaning in the default sql_mode and in sql_mode=ORACLE.

      To unify sql_yacc.yy and sql_yacc_ora.yy easier, we'll add sql_mode specific tokens for this keyword and modify the grammar in sql_yacc.yy and sql_yacc_ora.yy accordingly.

      Instead of DECODE_SYM, we'll have separate DECODE_MARIADB_SYM and DECODE_ORACLE_SYM.

      This will make possible for native and Oracle grammar rules to co-exists in the same *.yy files.

      By default, Lex_input_stream::find_keyword() will return DECODE_MARIADB_SYM, and translate it to DECODE_ORACLE_SYM in Oracle compatibility mode:

          if (m_thd->variables.sql_mode & MODE_ORACLE)
          {
            switch (symbol->tok) {
              ...
              case DECODE_MARIADB_SYM:         return DECODE_ORACLE_SYM;
              ...
            }
          }
      

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              bar Alexander Barkov
              bar Alexander Barkov
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                Created:
                Updated:
                Resolved:

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