Hello, In backend/parser/parser.c we have following code section: if(mode >RAW_PARSE_PLPGSQL_ASSIGN3) { /* Clean up (release memory) */ scanner_finish(yyscanner); ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("when ivorysql.compatible_mode is pg, not support a plisql procedural-language function statement"))); } I think this error message should be rewritten in a better English like: when ivorysql.compatible_mode is set to pg, any plisql procedural-language function statement is not supported. Do you agree ? If yes, can I work on the related patch ?