ALTER SQL_PARSER RULE 语法用于修改解析引擎规则配置。
AlterSqlParserRule ::=
'ALTER' 'SQL_PARSER' 'RULE' '(' sqlParserRuleDefinition ')'
sqlParserRuleDefinition ::=
parseTreeCacheDefinition? (',' sqlStatementCacheDefinition)?
parseTreeCacheDefinition ::=
'PARSE_TREE_CACHE' '(' cacheOption ')'
sqlStatementCacheDefinition ::=
'SQL_STATEMENT_CACHE' '(' cacheOption ')'
cacheOption ::=
('INITIAL_CAPACITY' '=' initialCapacity)? (','? 'MAXIMUM_SIZE' '=' maximumSize)?
initialCapacity ::=
int
maximumSize ::=
int
PARSE_TREE_CACHE：语法树本地缓存配置
SQL_STATEMENT_CACHE：SQL 语句本地缓存配置项
ALTER SQL_PARSER RULE (
PARSE_TREE_CACHE(INITIAL_CAPACITY=128, MAXIMUM_SIZE=1024),
SQL_STATEMENT_CACHE(INITIAL_CAPACITY=2000, MAXIMUM_SIZE=65535)
);
ALTER、SQL_PARSER、RULE、PARSE_TREE_CACHE、INITIAL_CAPACITY、MAXIMUM_SIZE、SQL_STATEMENT_CACHE