[MDEV-31184] Remove parser tokens DECODE_MARIADB_SYM and DECODE_ORACLE_SYM - Jira

Type: Task
Status: Closed (View Workflow)
Priority: Critical
Resolution: Fixed
Fix Version/s: 10.8.8, 10.4.32, 10.5.23, 10.6.16, 10.9.8, 10.10.7, 10.11.6, 11.0.4, 11.1.3, 11.2.2, 11.3.1
Component/s: Parser
Labels:
None

In order to fix ~~MDEV-27744~~ easier, let's change the code handling sql_mode-dependent function DECODE(), as the follows:

remove parser tokens DECODE_MARIADB_SYM and DECODE_ORACLE_SYM handling sql_mode-dependent function DECODE()
remove the DECODE() code from sql_yacc.yy/sql_yacc_ora.yy
add handling of DECODE() using regular Create_func means

blocks

MDEV-27744 LPAD in vcol created in ORACLE mode makes table corrupted in non-ORACLE

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