improved sql parser, bug fixed for parent is null

src/main/java/com/alibaba/druid/sql/ast/SQLDataTypeImpl.java

@@ -54,6 +54,13 @@ public class SQLDataTypeImpl extends SQLObjectImpl implements SQLDataType {
     public List<SQLExpr> getArguments() {
         return this.arguments;
     }
+    
+    public void addArgument(SQLExpr argument) {
+        if (argument != null) {
+            argument.setParent(this);
+        }
+        this.arguments.add(argument);
+    }
 
     @Override
     public int hashCode() {

src/main/java/com/alibaba/druid/sql/ast/SQLPartition.java

@@ -76,6 +76,13 @@ public class SQLPartition extends SQLObjectImpl {
     public List<SQLSubPartition> getSubPartitions() {
         return subPartitions;
     }
+    
+    public void addSubPartition(SQLSubPartition partition) {
+        if (partition != null) {
+            partition.setParent(this);
+        }
+        this.subPartitions.add(partition);
+    }
 
     public SQLExpr getIndexDirectory() {
         return indexDirectory;

src/main/java/com/alibaba/druid/sql/ast/SQLPartitionBy.java

@@ -33,6 +33,13 @@ public abstract class SQLPartitionBy extends SQLObjectImpl {
     public List<SQLPartition> getPartitions() {
         return partitions;
     }
+    
+    public void addPartition(SQLPartition partition) {
+        if (partition != null) {
+            partition.setParent(this);
+        }
+        this.partitions.add(partition);
+    }
 
     public SQLSubPartitionBy getSubPartitionBy() {
         return subPartitionBy;

src/main/java/com/alibaba/druid/sql/ast/SQLPartitionByList.java

@@ -53,4 +53,10 @@ public class SQLPartitionByList extends SQLPartitionBy {
         return columns;
     }
 
+    public void addColumn(SQLName column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
+    }
 }

src/main/java/com/alibaba/druid/sql/ast/SQLPartitionByRange.java

@@ -32,9 +32,12 @@ public class SQLPartitionByRange extends SQLPartitionBy {
     public List<SQLName> getColumns() {
         return columns;
     }
-
-    public void setColumns(List<SQLName> columns) {
-        this.columns = columns;
+    
+    public void addColumn(SQLName column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
     }
 
     public SQLExpr getInterval() {

src/main/java/com/alibaba/druid/sql/ast/SQLPartitionValue.java

@@ -33,6 +33,13 @@ public class SQLPartitionValue extends SQLObjectImpl {
     public List<SQLExpr> getItems() {
         return items;
     }
+    
+    public void addItem(SQLExpr item) {
+        if (item != null) {
+            item.setParent(this);
+        }
+        this.items.add(item);
+    }
 
     public Operator getOperator() {
         return operator;

src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateExpr.java

@@ -75,6 +75,13 @@ public class SQLAggregateExpr extends SQLExprImpl implements Serializable {
     public List<SQLExpr> getArguments() {
         return this.arguments;
     }
+    
+    public void addArgument(SQLExpr argument) {
+        if (argument != null) {
+            argument.setParent(this);
+        }
+        this.arguments.add(argument);
+    }
 
     public SQLOver getOver() {
         return over;

src/main/java/com/alibaba/druid/sql/ast/expr/SQLGroupingSetExpr.java

@@ -29,6 +29,13 @@ public class SQLGroupingSetExpr extends SQLExprImpl {
     public List<SQLExpr> getParameters() {
         return parameters;
     }
+    
+    public void addParameter(SQLExpr parameter) {
+        if (parameter != null) {
+            parameter.setParent(this);
+        }
+        this.parameters.add(parameter);
+    }
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {

src/main/java/com/alibaba/druid/sql/ast/expr/SQLListExpr.java

@@ -29,6 +29,13 @@ public class SQLListExpr extends SQLExprImpl {
     public List<SQLExpr> getItems() {
         return items;
     }
+    
+    public void addItem(SQLExpr item) {
+        if (item != null) {
+            item.setParent(this);
+        }
+        this.items.add(item);
+    }
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterDatabaseStatement.java

@@ -0,0 +1,47 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.SQLStatementImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterDatabaseStatement extends SQLStatementImpl {
+
+    private SQLName name;
+
+    private boolean upgradeDataDirectoryName;
+    
+    public SQLAlterDatabaseStatement() {
+        
+    }
+    
+    public SQLAlterDatabaseStatement(String dbType) {
+        this.setDbType(dbType);
+    }
+
+    public SQLName getName() {
+        return name;
+    }
+
+    public void setName(SQLName name) {
+        if (name != null) {
+            name.setParent(this);
+        }
+        this.name = name;
+    }
+
+    public boolean isUpgradeDataDirectoryName() {
+        return upgradeDataDirectoryName;
+    }
+
+    public void setUpgradeDataDirectoryName(boolean upgradeDataDirectoryName) {
+        this.upgradeDataDirectoryName = upgradeDataDirectoryName;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, name);
+        }
+        visitor.endVisit(this);
+    }
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableAddColumn.java

@@ -44,6 +44,13 @@ public class SQLAlterTableAddColumn extends SQLObjectImpl implements SQLAlterTab
     public List<SQLColumnDefinition> getColumns() {
         return columns;
     }
+    
+    public void addColumn(SQLColumnDefinition column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
+    }
 
     public SQLName getFirstColumn() {
         return firstColumn;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableAddIndex.java

@@ -57,6 +57,13 @@ public class SQLAlterTableAddIndex extends SQLObjectImpl implements SQLAlterTabl
     public List<SQLSelectOrderByItem> getItems() {
         return items;
     }
+    
+    public void addItem(SQLSelectOrderByItem item) {
+        if (item != null) {
+            item.setParent(this);
+        }
+        this.items.add(item);
+    }
 
     public SQLName getName() {
         return name;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableConvertCharSet.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 1999-2101 Alibaba Group Holding Ltd.
+ *
+ * Licensed 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 com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableConvertCharSet extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private SQLExpr charset;
+    private SQLExpr collate;
+    
+    public SQLAlterTableConvertCharSet() {
+        
+    }
+
+    public SQLExpr getCharset() {
+        return charset;
+    }
+
+    public void setCharset(SQLExpr charset) {
+        if (charset != null) {
+            charset.setParent(this);
+        }
+        this.charset = charset;
+    }
+
+    public SQLExpr getCollate() {
+        return collate;
+    }
+
+    public void setCollate(SQLExpr collate) {
+        if (collate != null) {
+            collate.setParent(this);
+        }
+        this.collate = collate;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, charset);
+            acceptChild(visitor, collate);
+        }
+        visitor.endVisit(this);
+    }
+
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableDropColumnItem.java

@@ -43,6 +43,13 @@ public class SQLAlterTableDropColumnItem extends SQLObjectImpl implements SQLAlt
     public List<SQLName> getColumns() {
         return columns;
     }
+    
+    public void addColumn(SQLName column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
+    }
 
     public boolean isCascade() {
         return cascade;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableStatement.java

@@ -25,22 +25,55 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 public class SQLAlterTableStatement extends SQLStatementImpl implements SQLDDLStatement {
 
     private SQLExprTableSource      tableSource;
-    private List<SQLAlterTableItem> items = new ArrayList<SQLAlterTableItem>();
-    
-    public SQLAlterTableStatement() {
-        
+    private List<SQLAlterTableItem> items                   = new ArrayList<SQLAlterTableItem>();
+
+    // for mysql
+    private boolean                 ignore                  = false;
+
+    private boolean                 updateGlobalIndexes     = false;
+    private boolean                 invalidateGlobalIndexes = false;
+
+    public SQLAlterTableStatement(){
+
     }
-    
-    public SQLAlterTableStatement(String dbType) {
-        super (dbType);
+
+    public SQLAlterTableStatement(String dbType){
+        super(dbType);
+    }
+
+    public boolean isIgnore() {
+        return ignore;
+    }
+
+    public void setIgnore(boolean ignore) {
+        this.ignore = ignore;
+    }
+
+    public boolean isUpdateGlobalIndexes() {
+        return updateGlobalIndexes;
+    }
+
+    public void setUpdateGlobalIndexes(boolean updateGlobalIndexes) {
+        this.updateGlobalIndexes = updateGlobalIndexes;
+    }
+
+    public boolean isInvalidateGlobalIndexes() {
+        return invalidateGlobalIndexes;
+    }
+
+    public void setInvalidateGlobalIndexes(boolean invalidateGlobalIndexes) {
+        this.invalidateGlobalIndexes = invalidateGlobalIndexes;
     }
 
     public List<SQLAlterTableItem> getItems() {
         return items;
     }
 
-    public void setItems(List<SQLAlterTableItem> items) {
-        this.items = items;
+    public void addItem(SQLAlterTableItem item) {
+        if (item != null) {
+            item.setParent(this);
+        }
+        this.items.add(item);
     }
 
     public SQLExprTableSource getTableSource() {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLColumnDefinition.java

@@ -99,6 +99,13 @@ public class SQLColumnDefinition extends SQLObjectImpl implements SQLTableElemen
     public List<SQLColumnConstraint> getConstraints() {
         return constraints;
     }
+    
+    public void addConstraint(SQLColumnConstraint constraint) {
+        if (constraint != null) {
+            constraint.setParent(this);
+        }
+        this.constraints.add(constraint);
+    }
 
     @Override
     public void output(StringBuffer buf) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateIndexStatement.java

@@ -59,8 +59,11 @@ public class SQLCreateIndexStatement extends SQLStatementImpl implements SQLDDLS
         return items;
     }
 
-    public void setItems(List<SQLSelectOrderByItem> items) {
-        this.items = items;
+    public void addItem(SQLSelectOrderByItem item) {
+        if (item != null) {
+            item.setParent(this);
+        }
+        this.items.add(item);
     }
 
     public SQLName getName() {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateViewStatement.java

@@ -82,6 +82,13 @@ public class SQLCreateViewStatement extends SQLStatementImpl implements SQLDDLSt
     public List<Column> getColumns() {
         return columns;
     }
+    
+    public void addColumn(Column column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
+    }
 
     public boolean isIfNotExists() {
         return ifNotExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableStatement.java

@@ -61,9 +61,12 @@ public class SQLDropTableStatement extends SQLStatementImpl implements SQLDDLSta
     public List<SQLExprTableSource> getTableSources() {
         return tableSources;
     }
-
-    public void setTableSources(List<SQLExprTableSource> tableSources) {
-        this.tableSources = tableSources;
+    
+    public void addPartition(SQLExprTableSource tableSource) {
+        if (tableSource != null) {
+            tableSource.setParent(this);
+        }
+        this.tableSources.add(tableSource);
     }
 
     public void setName(SQLName name) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropUserStatement.java

@@ -38,8 +38,11 @@ public class SQLDropUserStatement extends SQLStatementImpl implements SQLDDLStat
         return users;
     }
 
-    public void setUsers(List<SQLExpr> users) {
-        this.users = users;
+    public void addUser(SQLExpr user) {
+        if (user != null) {
+            user.setParent(this);
+        }
+        this.users.add(user);
     }
 
     protected void accept0(SQLASTVisitor visitor) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropViewStatement.java

@@ -49,9 +49,12 @@ public class SQLDropViewStatement extends SQLStatementImpl implements SQLDDLStat
     public List<SQLExprTableSource> getTableSources() {
         return tableSources;
     }
-
-    public void setTableSources(List<SQLExprTableSource> tableSources) {
-        this.tableSources = tableSources;
+    
+    public void addPartition(SQLExprTableSource tableSource) {
+        if (tableSource != null) {
+            tableSource.setParent(this);
+        }
+        this.tableSources.add(tableSource);
     }
 
     public void setName(SQLName name) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertInto.java

@@ -77,6 +77,13 @@ public abstract class SQLInsertInto extends SQLObjectImpl {
     public List<SQLExpr> getColumns() {
         return columns;
     }
+    
+    public void addColumn(SQLExpr column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
+    }
 
     public ValuesClause getValues() {
         return values;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLInsertStatement.java

@@ -19,6 +19,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLUnique.java

@@ -32,6 +32,13 @@ public class SQLUnique extends SQLConstraintImpl implements SQLUniqueConstraint,
     public List<SQLExpr> getColumns() {
         return columns;
     }
+    
+    public void addColumn(SQLExpr column) {
+        if (column != null) {
+            column.setParent(this);
+        }
+        this.columns.add(column);
+    }
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {

src/main/java/com/alibaba/druid/sql/ast/statement/SQLWithSubqueryClause.java

@@ -31,6 +31,13 @@ public class SQLWithSubqueryClause extends SQLObjectImpl {
     public List<Entry> getEntries() {
         return entries;
     }
+    
+    public void addEntry(Entry entrie) {
+        if (entrie != null) {
+            entrie.setParent(this);
+        }
+        this.entries.add(entrie);
+    }
 
     public Boolean getRecursive() {
         return recursive;