Fix obvious mistakes like spelling errors

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

@@ -17,7 +17,7 @@ package com.alibaba.druid.sql.ast.statement;
 
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class NotNullConstraint extends SQLConstaintImpl implements SQLColumnConstraint {
+public class NotNullConstraint extends SQLConstraintImpl implements SQLColumnConstraint {
 
     public NotNullConstraint(){
 

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

@@ -20,14 +20,14 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public class SQLAlterTableAddConstraint extends SQLObjectImpl implements SQLAlterTableItem {
 
-    private SQLConstaint constraint;
+    private SQLConstraint constraint;
     private boolean      withNoCheck = false;
 
     public SQLAlterTableAddConstraint(){
 
     }
 
-    public SQLAlterTableAddConstraint(SQLConstaint constraint){
+    public SQLAlterTableAddConstraint(SQLConstraint constraint){
         this.setConstraint(constraint);
     }
 
@@ -39,11 +39,11 @@ public class SQLAlterTableAddConstraint extends SQLObjectImpl implements SQLAlte
         visitor.endVisit(this);
     }
 
-    public SQLConstaint getConstraint() {
+    public SQLConstraint getConstraint() {
         return constraint;
     }
 
-    public void setConstraint(SQLConstaint constraint) {
+    public void setConstraint(SQLConstraint constraint) {
         if (constraint != null) {
             constraint.setParent(this);
         }

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

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLAlterTableDropForeinKey extends SQLObjectImpl implements SQLAlterTableItem {
+public class SQLAlterTableDropForeignKey extends SQLObjectImpl implements SQLAlterTableItem {
 
     private SQLName indexName;
 

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

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.ast.statement;
 import com.alibaba.druid.sql.ast.SQLDataTypeImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCharactorDataType extends SQLDataTypeImpl {
+public class SQLCharacterDataType extends SQLDataTypeImpl {
 
     private String             charSetName;
     private String             collate;
@@ -28,7 +28,7 @@ public class SQLCharactorDataType extends SQLDataTypeImpl {
     public final static String CHAR_TYPE_BYTE = "BYTE";
     public final static String CHAR_TYPE_CHAR = "CHAR";
 
-    public SQLCharactorDataType(String name){
+    public SQLCharacterDataType(String name){
         super(name);
     }
 

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

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.ast.statement;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCheck extends SQLConstaintImpl implements SQLTableElement {
+public class SQLCheck extends SQLConstraintImpl implements SQLTableElement {
 
     private SQLExpr expr;
 

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

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.ast.statement;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLColumnCheck extends SQLConstaintImpl implements SQLColumnConstraint {
+public class SQLColumnCheck extends SQLConstraintImpl implements SQLColumnConstraint {
 
     private SQLExpr expr;
 

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

@@ -15,6 +15,6 @@
  */
 package com.alibaba.druid.sql.ast.statement;
 
-public interface SQLColumnConstraint extends SQLConstaint {
+public interface SQLColumnConstraint extends SQLConstraint {
 
 }

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

@@ -15,21 +15,21 @@
  */
 package com.alibaba.druid.sql.ast.statement;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import com.alibaba.druid.sql.ast.SQLDataType;
 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.visitor.SQLASTVisitor;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class SQLColumnDefinition extends SQLObjectImpl implements SQLTableElement {
 
     protected SQLName                         name;
     protected SQLDataType                     dataType;
     protected SQLExpr                         defaultExpr;
-    protected final List<SQLColumnConstraint> constaints = new ArrayList<SQLColumnConstraint>(0);
+    protected final List<SQLColumnConstraint> constraints = new ArrayList<SQLColumnConstraint>(0);
     protected SQLExpr                          comment;
 
     protected Boolean                         enable;
@@ -73,8 +73,8 @@ public class SQLColumnDefinition extends SQLObjectImpl implements SQLTableElemen
         this.defaultExpr = defaultExpr;
     }
 
-    public List<SQLColumnConstraint> getConstaints() {
-        return constaints;
+    public List<SQLColumnConstraint> getConstraints() {
+        return constraints;
     }
 
     @Override
@@ -94,7 +94,7 @@ public class SQLColumnDefinition extends SQLObjectImpl implements SQLTableElemen
             this.acceptChild(visitor, name);
             this.acceptChild(visitor, dataType);
             this.acceptChild(visitor, defaultExpr);
-            this.acceptChild(visitor, constaints);
+            this.acceptChild(visitor, constraints);
         }
         visitor.endVisit(this);
     }

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

@@ -17,7 +17,7 @@ package com.alibaba.druid.sql.ast.statement;
 
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLColumnPrimaryKey extends SQLConstaintImpl implements SQLColumnConstraint {
+public class SQLColumnPrimaryKey extends SQLConstraintImpl implements SQLColumnConstraint {
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {

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

@@ -21,7 +21,7 @@ import java.util.List;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLColumnReference extends SQLConstaintImpl implements SQLColumnConstraint {
+public class SQLColumnReference extends SQLConstraintImpl implements SQLColumnConstraint {
 
     private SQLName       table;
     private List<SQLName> columns = new ArrayList<SQLName>();

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

@@ -17,7 +17,7 @@ package com.alibaba.druid.sql.ast.statement;
 
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLColumnUniqueKey extends SQLConstaintImpl implements SQLColumnConstraint {
+public class SQLColumnUniqueKey extends SQLConstraintImpl implements SQLColumnConstraint {
 
     @Override
     protected void accept0(SQLASTVisitor visitor) {

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

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.ast.statement;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObject;
 
-public interface SQLConstaint extends SQLObject {
+public interface SQLConstraint extends SQLObject {
 
     SQLName getName();
 

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

@@ -18,12 +18,12 @@ package com.alibaba.druid.sql.ast.statement;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 
-public abstract class SQLConstaintImpl extends SQLObjectImpl implements SQLConstaint {
+public abstract class SQLConstraintImpl extends SQLObjectImpl implements SQLConstraint {
 
     private SQLName name;
     private Boolean enable;
 
-    public SQLConstaintImpl(){
+    public SQLConstraintImpl(){
 
     }
 

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

@@ -19,7 +19,7 @@ import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLName;
 
-public interface SQLForeignKeyConstraint extends SQLConstaint, SQLTableElement, SQLTableConstaint {
+public interface SQLForeignKeyConstraint extends SQLConstraint, SQLTableElement, SQLTableConstraint {
 
     List<SQLName> getReferencingColumns();
 

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

@@ -21,7 +21,7 @@ import java.util.List;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLForeignKeyImpl extends SQLConstaintImpl implements SQLForeignKeyConstraint {
+public class SQLForeignKeyImpl extends SQLConstraintImpl implements SQLForeignKeyConstraint {
 
     private SQLName       referencedTableName;
     private List<SQLName> referencingColumns = new ArrayList<SQLName>();

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

@@ -15,6 +15,6 @@
  */
 package com.alibaba.druid.sql.ast.statement;
 
-public interface SQLTableConstaint extends SQLConstaint, SQLTableElement {
+public interface SQLTableConstraint extends SQLConstraint, SQLTableElement {
 
 }

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

@@ -21,7 +21,7 @@ import java.util.List;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLUnique extends SQLConstaintImpl implements SQLUniqueConstraint, SQLTableElement {
+public class SQLUnique extends SQLConstraintImpl implements SQLUniqueConstraint, SQLTableElement {
 
     private final List<SQLExpr> columns = new ArrayList<SQLExpr>();
 

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

@@ -19,7 +19,7 @@ import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
 
-public interface SQLUniqueConstraint extends SQLConstaint {
+public interface SQLUniqueConstraint extends SQLConstraint {
 
     List<SQLExpr> getColumns();