bug fixed for sql parser.

src/main/java/com/alibaba/druid/sql/SQLUtils.java

@@ -915,7 +915,7 @@ public class SQLUtils {
         }
 
         tableName = normalize(tableName);
-        long hash = Utils.fnv_64_lower(tableName);
+        long hash = Utils.fnv_32_lower(tableName);
         return Utils.hex_t(hash);
     }
 

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

@@ -37,10 +37,18 @@ public class SQLUnique extends SQLConstraintImpl implements SQLUniqueConstraint,
     }
     
     public void addColumn(SQLExpr column) {
+        if (column == null) {
+            return;
+        }
+
+        addColumn(new SQLSelectOrderByItem(column));
+    }
+
+    public void addColumn(SQLSelectOrderByItem column) {
         if (column != null) {
             column.setParent(this);
         }
-        this.columns.add(new SQLSelectOrderByItem(column));
+        this.columns.add(column);
     }
 
     @Override

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java

@@ -21,15 +21,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLObject;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
-import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
-import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
-import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
-import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
-import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
-import com.alibaba.druid.sql.ast.statement.SQLStartTransactionStatement;
-import com.alibaba.druid.sql.ast.statement.SQLTableSource;
-import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
-import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
+import com.alibaba.druid.sql.ast.statement.*;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlForceIndexHint;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlIgnoreIndexHint;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlKey;
@@ -257,8 +249,9 @@ public class MySqlSchemaStatVisitor extends SchemaStatVisitor implements MySqlAS
 
     @Override
     public boolean visit(MySqlPrimaryKey x) {
-        for (SQLObject item : x.getColumns()) {
-            item.accept(this);
+        for (SQLSelectOrderByItem item : x.getColumns()) {
+            SQLExpr expr = item.getExpr();
+            expr.accept(this);
         }
         return false;
     }

src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java

@@ -1764,10 +1764,17 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
     }
 
     public boolean visit(SQLDropTableStatement x) {
+        print0(ucase ? "DROP " : "drop ");
+        List<SQLCommentHint> hints = x.getHints();
+        if (hints != null) {
+            printAndAccept(hints, " ");
+            print(' ');
+        };
+
         if (x.isTemporary()) {
-            print0(ucase ? "DROP TEMPORARY TABLE " : "drop temporary table ");
+            print0(ucase ? "TEMPORARY TABLE " : "temporary table ");
         } else {
-            print0(ucase ? "DROP TABLE " : "drop table ");
+            print0(ucase ? "TABLE " : "table ");
         }
 
         if (x.isIfExists()) {

src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java

@@ -1056,6 +1056,9 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
         }
         if (column != null) {
             SQLObject parent = x.getParent();
+            if (parent instanceof SQLSelectOrderByItem) {
+                parent = parent.getParent();
+            }
             if (parent instanceof SQLPrimaryKey) {
                 column.setPrimaryKey(true);
             } else if (parent instanceof SQLUnique) {

src/main/java/com/alibaba/druid/util/Utils.java

@@ -442,6 +442,25 @@ public class Utils {
         return hashCode;
     }
 
+    public static long fnv_32_lower(String key) {
+        long hashCode = 0x811c9dc5;
+        for (int i = 0; i < key.length(); ++i) {
+            char ch = key.charAt(i);
+            if (ch == '_' || ch == '-') {
+                continue;
+            }
+
+            if (ch >= 'A' && ch <= 'Z') {
+                ch = (char) (ch + 32);
+            }
+
+            hashCode ^= ch;
+            hashCode *= 0x01000193;
+        }
+
+        return hashCode;
+    }
+
     public static void loadFromFile(String path, Set<String> set) {
         InputStream is = null;
         BufferedReader reader = null;