support Oracle switch SQL

parser/sql/dialect/oracle/src/main/antlr4/imports/oracle/DDLStatement.g4

@@ -4010,7 +4010,7 @@ tablespaceFileNameConvert
     ;
 
 alterTablespaceEncryption
-    : ENCRYPTION(OFFLINE (tablespaceEncryptionSpec? ENCRYPT | DECRYPT) 
+    : ENCRYPTION(OFFLINE (tablespaceEncryptionSpec? ENCRYPT | DECRYPT)
     | ONLINE (tablespaceEncryptionSpec? (ENCRYPT | REKEY) | DECRYPT) tablespaceFileNameConvert?
     | FINISH (ENCRYPT | REKEY | DECRYPT) tablespaceFileNameConvert?)
     ;
@@ -4126,3 +4126,17 @@ plsqlLibrarySource
 agentClause
     : (AGENT agentDblink)? (CREDENTIAL credentialName)?
     ;
+
+switch
+    : SWITCH switchClause TO COPY
+    ;
+
+switchClause
+    : DATABASE
+    | DATAFILE datafileSpecClause (COMMA_ datafileSpecClause)*
+    | TABLESPACE SQ_? tablespaceName SQ_? (COMMA_ SQ_? tablespaceName SQ_?)*
+    ;
+
+datafileSpecClause
+    : SQ_ fileName SQ_ | INTEGER_
+    ;

parser/sql/dialect/oracle/src/main/antlr4/org/apache/shardingsphere/sql/parser/autogen/OracleStatement.g4

@@ -156,5 +156,6 @@ execute
     | createJava
     | plsqlBlock
     | createLibrary
+    | switch
     ) SEMI_?
     ;

parser/sql/dialect/oracle/src/main/java/org/apache/shardingsphere/sql/parser/oracle/visitor/statement/type/OracleDDLStatementVisitor.java

@@ -141,6 +141,7 @@
 import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.FlashbackDatabaseContext;
 import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.FlashbackTableContext;
 import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.FunctionContext;
+import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.SwitchContext;
 import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.IndexExpressionContext;
 import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.IndexExpressionsContext;
 import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.IndexNameContext;
@@ -307,6 +308,7 @@
 import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl.OraclePLSQLBlockStatement;
 import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl.OraclePurgeStatement;
 import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl.OracleRenameStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl.OracleSwitchStatement;
 import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl.OracleSystemActionStatement;
 import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl.OracleTruncateStatement;
 
@@ -1349,4 +1351,10 @@ public ASTNode visitCreateJava(final CreateJavaContext ctx) {
     public ASTNode visitCreateLibrary(final CreateLibraryContext ctx) {
         return new OracleCreateLibraryStatement();
     }
+
+    @Override
+    public ASTNode visitSwitch(final SwitchContext ctx) {
+        return new OracleSwitchStatement();
+    }
+
 }

parser/sql/engine/src/main/java/org/apache/shardingsphere/sql/parser/core/database/visitor/SQLVisitorRule.java

@@ -699,7 +699,9 @@ public enum SQLVisitorRule {
 
     PLSQL_BLOCK("PlsqlBlock", SQLStatementType.DDL),
 
-    CREATE_LIBRARY("CreateLibrary", SQLStatementType.DDL);
+    CREATE_LIBRARY("CreateLibrary", SQLStatementType.DDL),
+
+    SWITCH("Switch", SQLStatementType.DDL);
 
     private final String name;
 

parser/sql/statement/src/main/java/org/apache/shardingsphere/sql/parser/sql/dialect/statement/oracle/ddl/OracleSwitchStatement.java

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.ddl;
+
+import org.apache.shardingsphere.sql.parser.sql.common.statement.AbstractSQLStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.oracle.OracleStatement;
+
+/**
+ * Oracle switch statement.
+ */
+public final class OracleSwitchStatement extends AbstractSQLStatement implements OracleStatement {
+}

test/it/parser/src/main/java/org/apache/shardingsphere/test/it/sql/parser/internal/cases/parser/jaxb/RootSQLParserTestCases.java

@@ -285,6 +285,7 @@
 import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl.RenameStatementTestCase;
 import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl.RenameTableStatementTestCase;
 import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl.SecurityLabelStmtStatementTestCase;
+import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl.SwitchStatementTestCase;
 import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl.TruncateStatementTestCase;
 import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl.UnlistenStatementTestCase;
 import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.dml.CallStatementTestCase;
@@ -1720,6 +1721,9 @@ public final class RootSQLParserTestCases {
     @XmlElement(name = "create-library")
     private final List<CreateLibraryStatementTestCase> createLibraryStatementTestCases = new LinkedList<>();
 
+    @XmlElement(name = "switch")
+    private final List<SwitchStatementTestCase> switchStatementTestCases = new LinkedList<>();
+
     /**
      * Get all SQL parser test cases.
      *

test/it/parser/src/main/java/org/apache/shardingsphere/test/it/sql/parser/internal/cases/parser/jaxb/statement/ddl/SwitchStatementTestCase.java

@@ -0,0 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.statement.ddl;
+
+import org.apache.shardingsphere.test.it.sql.parser.internal.cases.parser.jaxb.SQLParserTestCase;
+
+/**
+ * Switch statement test case.
+ */
+public final class SwitchStatementTestCase extends SQLParserTestCase {
+}

test/it/parser/src/main/resources/case/ddl/switch.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one or more
+  ~ contributor license agreements.  See the NOTICE file distributed with
+  ~ this work for additional information regarding copyright ownership.
+  ~ The ASF licenses this file to You under the Apache License, Version 2.0
+  ~ (the "License"); you may not use this file except in compliance with
+  ~ the License.  You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<sql-parser-test-cases>
+    <switch sql-case-id="switch" />
+</sql-parser-test-cases>

test/it/parser/src/main/resources/sql/supported/ddl/switch.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one or more
+  ~ contributor license agreements.  See the NOTICE file distributed with
+  ~ this work for additional information regarding copyright ownership.
+  ~ The ASF licenses this file to You under the Apache License, Version 2.0
+  ~ (the "License"); you may not use this file except in compliance with
+  ~ the License.  You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<sql-cases>
+    <sql-case id="switch" value="SWITCH DATABASE TO COPY;" db-types="Oracle" />
+</sql-cases>