enhance sql parser

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlSelectParser.java

@@ -40,7 +40,7 @@ public class MySqlSelectParser extends SQLSelectParser {
     }
 
     @Override
-    protected SQLSelectQuery query() throws ParserException {
+    public SQLSelectQuery query() throws ParserException {
         if (lexer.token() == (Token.LPAREN)) {
             lexer.nextToken();
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleSelectParser.java

@@ -229,7 +229,7 @@ public class OracleSelectParser extends SQLSelectParser {
         return select;
     }
 
-    protected SQLSelectQuery query() {
+    public SQLSelectQuery query() {
         if (lexer.token() == (Token.LPAREN)) {
             lexer.nextToken();
 

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGSelectParser.java

@@ -23,7 +23,7 @@ public class PGSelectParser extends SQLSelectParser {
 	}
 
 	@Override
-	protected SQLSelectQuery query() throws ParserException {
+	public SQLSelectQuery query() throws ParserException {
 		PGSelectQueryBlock queryBlock = new PGSelectQueryBlock();
 
 		accept(Token.SELECT);

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/parser/SQLServerSelectParser.java

@@ -35,7 +35,7 @@ public class SQLServerSelectParser extends SQLSelectParser {
         return select;
     }
 
-    protected SQLSelectQuery query() throws ParserException {
+    public SQLSelectQuery query() throws ParserException {
         if (lexer.token() == Token.LPAREN) {
             lexer.nextToken();
 

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

@@ -28,6 +28,10 @@ public class SQLParser {
         this.lexer = lexer;
     }
 
+    public final Lexer getLexer() {
+        return lexer;
+    }
+
     protected boolean identifierEquals(String text) {
         return lexer.token() == Token.IDENTIFIER && lexer.stringVal().equalsIgnoreCase(text);
     }

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

@@ -102,7 +102,7 @@ public class SQLSelectParser extends SQLParser {
         return selectQuery;
     }
 
-    protected SQLSelectQuery query() throws ParserException {
+    public SQLSelectQuery query() throws ParserException {
         if (lexer.token() == Token.LPAREN) {
             lexer.nextToken();