sql parser refactor

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -449,7 +449,7 @@ public class SQLExprParser extends SQLParser {
     }
 
     public SQLSelectParser createSelectParser() {
-        return new SQLSelectParser(lexer);
+        return new SQLSelectParser(this);
     }
 
     public SQLExpr primaryRest(SQLExpr expr) throws ParserException {

src/main/java/com/alibaba/druid/sql/parser/SQLSelectParser.java

@@ -31,6 +31,7 @@ import com.alibaba.druid.sql.ast.statement.SQLUnionOperator;
 import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
 
 public class SQLSelectParser extends SQLParser {
+    protected SQLExprParser exprParser;
 
     public SQLSelectParser(String sql){
         super(sql);
@@ -39,6 +40,11 @@ public class SQLSelectParser extends SQLParser {
     public SQLSelectParser(Lexer lexer){
         super(lexer);
     }
+    
+    public SQLSelectParser(SQLExprParser exprParser){
+        super(exprParser.getLexer());
+        this.exprParser = exprParser;
+    }
 
     public SQLSelect select() throws ParserException {
         SQLSelect select = new SQLSelect();

src/main/java/com/alibaba/druid/sql/parser/SQLStatementParser.java

@@ -484,7 +484,7 @@ public class SQLStatementParser extends SQLParser {
     }
 
     public SQLSelectParser createSQLSelectParser() {
-        return new SQLSelectParser(this.lexer);
+        return new SQLSelectParser(this.exprParser);
     }
 
     public SQLUpdateStatement parseUpdateStatement() throws ParserException {
@@ -573,7 +573,7 @@ public class SQLStatementParser extends SQLParser {
 
         this.accept(Token.AS);
 
-        createView.setSubQuery(new SQLSelectParser(this.lexer).select());
+        createView.setSubQuery(new SQLSelectParser(this.exprParser).select());
         return createView;
     }