bug fixed for mysql connection validation checker, and improved odps sql formatter

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/expr/MySqlCharExpr.java

@@ -15,6 +15,7 @@
  */
 package com.alibaba.druid.sql.dialect.mysql.ast.expr;
 
+import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
@@ -76,4 +77,10 @@ public class MySqlCharExpr extends SQLCharExpr implements MySqlExpr {
         visitor.visit(this);
         visitor.endVisit(this);
     }
+    
+    public String toString() {
+        StringBuffer buf = new StringBuffer();
+        output(buf);
+        return buf.toString();
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/odps/ast/OdpsSelectQueryBlock.java

@@ -18,6 +18,7 @@ package com.alibaba.druid.sql.dialect.odps.ast;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLHint;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
@@ -34,8 +35,8 @@ public class OdpsSelectQueryBlock extends SQLSelectQueryBlock {
 
     protected List<SQLHint> hints;
 
-    protected SQLExpr distributeBy;
-    protected SQLSelectOrderByItem sortBy;
+    protected SQLExpr                    distributeBy;
+    protected List<SQLSelectOrderByItem> sortBy = new ArrayList<SQLSelectOrderByItem>(2);
 
     public OdpsSelectQueryBlock(){
 
@@ -57,14 +58,10 @@ public class OdpsSelectQueryBlock extends SQLSelectQueryBlock {
         this.distributeBy = distributeBy;
     }
 
-    public SQLSelectOrderByItem getSortBy() {
+    public List<SQLSelectOrderByItem> getSortBy() {
         return sortBy;
     }
 
-    public void setSortBy(SQLSelectOrderByItem sortBy) {
-        this.sortBy = sortBy;
-    }
-
     public SQLExpr getLimit() {
         return limit;
     }
@@ -138,4 +135,7 @@ public class OdpsSelectQueryBlock extends SQLSelectQueryBlock {
         visitor.endVisit(this);
     }
 
+    public String toString() {
+        return SQLUtils.toOdpsString(this);
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/odps/parser/OdpsExprParser.java

@@ -17,11 +17,15 @@ package com.alibaba.druid.sql.dialect.odps.parser;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.expr.SQLArrayExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
 import com.alibaba.druid.sql.dialect.odps.ast.OdpsUDTFSQLSelectItem;
+import com.alibaba.druid.sql.parser.EOFParserException;
 import com.alibaba.druid.sql.parser.Lexer;
+import com.alibaba.druid.sql.parser.ParserException;
 import com.alibaba.druid.sql.parser.SQLExprParser;
 import com.alibaba.druid.sql.parser.Token;
 
@@ -131,4 +135,23 @@ public class OdpsExprParser extends SQLExprParser {
         
         return super.primaryRest(expr);
     }
+    
+    public SQLExpr equalityRest(SQLExpr expr) {
+        if (lexer.token() == Token.EQEQ) {
+            SQLExpr rightExp;
+            lexer.nextToken();
+            try {
+                rightExp = bitOr();
+            } catch (EOFParserException e) {
+                throw new ParserException("EOF, " + expr + "=", e);
+            }
+            rightExp = equalityRest(rightExp);
+
+            expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.Equality, rightExp, getDbType());
+            
+            return expr;
+        }
+        
+        return super.equalityRest(expr);
+    }
 }

src/main/java/com/alibaba/druid/sql/dialect/odps/parser/OdpsSelectParser.java

@@ -90,19 +90,28 @@ public class OdpsSelectParser extends SQLSelectParser {
             if (identifierEquals("SORT")) {
                 lexer.nextToken();
                 accept(Token.BY);
-                SQLExpr expr = this.expr();
                 
-                SQLSelectOrderByItem sortBy = new SQLSelectOrderByItem(expr);
-                
-                if (lexer.token() == Token.ASC) {
-                    sortBy.setType(SQLOrderingSpecification.ASC);
-                    lexer.nextToken();
-                } else if (lexer.token() == Token.DESC) {
-                    sortBy.setType(SQLOrderingSpecification.DESC);
-                    lexer.nextToken();
+                for (;;) {
+                    SQLExpr expr = this.expr();
+                    
+                    SQLSelectOrderByItem sortByItem = new SQLSelectOrderByItem(expr);
+                    
+                    if (lexer.token() == Token.ASC) {
+                        sortByItem.setType(SQLOrderingSpecification.ASC);
+                        lexer.nextToken();
+                    } else if (lexer.token() == Token.DESC) {
+                        sortByItem.setType(SQLOrderingSpecification.DESC);
+                        lexer.nextToken();
+                    }
+                    
+                    queryBlock.getSortBy().add(sortByItem);
+                    
+                    if (lexer.token() == Token.COMMA) {
+                        lexer.nextToken();
+                    } else {
+                        break;
+                    }
                 }
-                
-                queryBlock.setSortBy(sortBy);
             }
         }
 

src/main/java/com/alibaba/druid/sql/dialect/odps/visitor/OdpsOutputVisitor.java

@@ -526,9 +526,9 @@ public class OdpsOutputVisitor extends SQLASTOutputVisitor implements OdpsASTVis
             print("DISTRIBUTE BY ");
             x.getDistributeBy().accept(this);
 
-            if (x.getSortBy() != null) {
+            if (!x.getSortBy().isEmpty()) {
                 print(" SORT BY ");
-                x.getSortBy().accept(this);
+                printAndAccept(x.getSortBy(), ", ");
             }
         }