fix g4 of mysql dal (#5547)

shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-mysql/src/main/antlr4/imports/mysql/BaseRule.g4

@@ -587,3 +587,11 @@ notExistClause_
 existClause_
     : (IF EXISTS)?
     ;
+
+pattern
+    : STRING_
+    ;
+
+connectionId_
+    : NUMBER_
+    ;

shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-mysql/src/main/antlr4/imports/mysql/DALStatement.g4

@@ -17,26 +17,33 @@
 
 grammar DALStatement;
 
-import Symbol, Keyword, MySQLKeyword, Literals, BaseRule;
+import Symbol, Keyword, MySQLKeyword, Literals, BaseRule, DMLStatement;
 
 use
     : USE schemaName
     ;
 
-desc
-    : (DESC | DESCRIBE) tableName
+help
+    : HELP STRING_
+    ;
+
+explain
+    : (DESC | DESCRIBE | EXPLAIN)
+    (tableName (columnName | pattern)?
+    | explainType? (explainableStatement | FOR CONNECTION connectionId_)
+    | ANALYZE select)
     ;
 
 showDatabases
-    : SHOW (DATABASES | SCHEMAS) (showLike | showWhereClause_)?
+    : SHOW (DATABASES | SCHEMAS) showFilter?
     ;
 
 showTables
-    : SHOW EXTENDED? FULL? TABLES fromSchema? (showLike | showWhereClause_)?
+    : SHOW EXTENDED? FULL? TABLES fromSchema? showFilter?
     ;
 
 showTableStatus
-    : SHOW TABLE STATUS fromSchema? (showLike | showWhereClause_)?
+    : SHOW TABLE STATUS fromSchema? showFilter?
     ;
 
 showColumns
@@ -108,7 +115,7 @@ showCollation
     ;
 
 showCreateDatabase
-    : SHOW CREATE (DATABASE | SCHEMA) (IF NOT EXISTS)? schemaName
+    : SHOW CREATE (DATABASE | SCHEMA) notExistClause_ schemaName
     ;
 
 showCreateEvent
@@ -144,7 +151,7 @@ showEngines
     ;
 
 showErrors
-    : SHOW ((ERRORS (LIMIT (NUMBER_ COMMA_)? NUMBER_)?) | (COUNT LP_ ASTERISK_ RP_ ERRORS))
+    : SHOW (COUNT LP_ ASTERISK_ RP_)? ERRORS (LIMIT (NUMBER_ COMMA_)? NUMBER_)?
     ;
 
 showEvents
@@ -160,7 +167,7 @@ showFunctionStatus
     ;
 
 showGrant
-    : SHOW GRANTS ( FOR (userName | roleName) (USING roleName (COMMA_ roleName)+)?)
+    : SHOW GRANTS (FOR userOrRole (USING roleName (COMMA_ roleName)+)?)?
     ;
 
 showMasterStatus
@@ -192,7 +199,7 @@ showProcesslist
     ;
 
 showProfile
-    : SHOW PROFILE ( showProfileType (COMMA_ showProfileType)*)? (FOR QUERY NUMBER_)? (LIMIT NUMBER_ (OFFSET NUMBER_))?
+    : SHOW PROFILE ( showProfileType (COMMA_ showProfileType)*)? (FOR QUERY NUMBER_)? (LIMIT NUMBER_ (OFFSET NUMBER_)?)?
     ;
 
 showProfiles
@@ -200,7 +207,7 @@ showProfiles
     ;
 
 showRelaylogEvent
-    : SHOW RELAYLOG EVENTS (IN logName)? (FROM NUMBER_)? (LIMIT (NUMBER_ COMMA_)? NUMBER_) FOR CHANNEL channelName
+    : SHOW RELAYLOG EVENTS (IN logName)? (FROM NUMBER_)? (LIMIT (NUMBER_ COMMA_)? NUMBER_)? FOR CHANNEL channelName
     ;
 
 showSlavehost
@@ -208,11 +215,11 @@ showSlavehost
     ;
 
 showSlaveStatus
-    : SHOW SLAVE STATUS (FOR CHANNEL channelName)
+    : SHOW SLAVE STATUS (FOR CHANNEL channelName)?
     ;
 
 showStatus
-    : SHOW (GLOBAL | SESSION) STATUS showFilter?
+    : SHOW (GLOBAL | SESSION)? STATUS showFilter?
     ;
 
 showTrriggers
@@ -220,11 +227,11 @@ showTrriggers
     ;
 
 showVariables
-    : SHOW (GLOBAL | SESSION)? VARIABLES showFilter
+    : SHOW (GLOBAL | SESSION)? VARIABLES showFilter?
     ;
 
 showWarnings
-    : SHOW ((WARNINGS (LIMIT (NUMBER_ COMMA_)? NUMBER_)?) | (COUNT LP_ ASTERISK_ RP_ WARNINGS))
+    : SHOW (COUNT LP_ ASTERISK_ RP_)? WARNINGS (LIMIT (NUMBER_ COMMA_)? NUMBER_)?
     ;
 
 setCharacter
@@ -241,11 +248,11 @@ clone
 
 cloneAction_
     : LOCAL DATA DIRECTORY EQ_? cloneDir SEMI_
-    | INSTANCE FROM cloneInstance IDENTIFIED BY STRING_ (DATA DIRECTORY EQ_ cloneDir)? (REQUIRE NO? SSL)?
+    | INSTANCE FROM cloneInstance IDENTIFIED BY STRING_ (DATA DIRECTORY EQ_? cloneDir)? (REQUIRE NO? SSL)?
     ;
 
 createUdf
-    : CREATE AGGREGATE FUNCTION functionName RETURNS ( STRING | INTEGER | REAL | DECIMAL) SONAME shardLibraryName
+    : CREATE AGGREGATE? FUNCTION functionName RETURNS (STRING | INTEGER | REAL | DECIMAL) SONAME shardLibraryName
     ;
 
 installComponent
@@ -320,7 +327,7 @@ cacheIndex
     ;
 
 tableIndexList
-    : tableName (PARTITION LP_ partitionList RP_)? ((INDEX | KEY) LP_ indexName (COMMA_ indexName)* RP_)?
+    : tableName (PARTITION LP_ partitionList RP_)? ((INDEX | KEY) LP_ indexName (COMMA_ indexName)* RP_)? (IGNORE LEAVES)?
     ;
 
 partitionList
@@ -328,7 +335,7 @@ partitionList
     ;
 
 flush
-    : FLUSH (NO_WRITE_TO_BINLOG | LOCAL)? (flushOption_ (COMMA_ flushOption_) * | tablesOption_)
+    : FLUSH (NO_WRITE_TO_BINLOG | LOCAL)? (flushOption_ (COMMA_ flushOption_)* | tablesOption_)
     ;
 
 flushOption_
@@ -358,7 +365,7 @@ resetOption_
     ;
 
 resetPersist
-    : RESET PERSIST ((IF EXISTS)? IDENTIFIER_)
+    : RESET PERSIST (existClause_ IDENTIFIER_)
     ;
 
 restart
@@ -368,3 +375,16 @@ restart
 shutdown
     : SHUTDOWN
     ;
+
+explainType
+    : FORMAT EQ_ formatName
+    ;
+
+explainableStatement
+    : select | tableStatement | delete | insert | replace | update
+    ;
+
+
+formatName
+    : 'TRADITIONAL' | JSON | 'TREE'
+    ;

shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-mysql/src/main/antlr4/org/apache/shardingsphere/sql/parser/autogen/MySQLStatement.g4

@@ -52,7 +52,7 @@ execute
     | setRole
     | setPassword
     | use
-    | desc
+    | explain
     | showDatabases
     | showTables
     | showTableStatus

shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-mysql/src/main/java/org/apache/shardingsphere/sql/parser/mysql/visitor/impl/MySQLDALVisitor.java

@@ -23,7 +23,7 @@ import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.Variabl
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.AnalyzeTableContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.CacheIndexContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.ChecksumTableContext;
-import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.DescContext;
+import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.ExplainContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.FlushContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.FromSchemaContext;
 import org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser.FromTableContext;
@@ -212,7 +212,7 @@ public final class MySQLDALVisitor extends MySQLVisitor implements DALVisitor {
     }
     
     @Override
-    public ASTNode visitDesc(final DescContext ctx) {
+    public ASTNode visitExplain(final ExplainContext ctx) {
         DescribeStatement result = new DescribeStatement();
         result.setTable((SimpleTableSegment) visit(ctx.tableName()));
         return result;