modify sparkSql grammar

src/grammar/spark/SparkSql.g4

@@ -75,7 +75,11 @@ program
     ;
 
 singleStatement
-    : statement ';'* EOF
+    : (statement SEMICOLON? | emptyStatement)*
+    ;
+
+emptyStatement
+    : SEMICOLON
     ;
 
 singleExpression
@@ -1741,6 +1745,7 @@ AMPERSAND: '&';
 PIPE: '|';
 CONCAT_PIPE: '||';
 HAT: '^';
+SEMICOLON: ';';
 
 STRING
     : '\'' ( ~('\''|'\\') | ('\\' .) )* '\''

src/lib/spark/SparkSqlListener.js

@@ -29,6 +29,15 @@ SparkSqlListener.prototype.exitSingleStatement = function(ctx) {
 };
 
 
+// Enter a parse tree produced by SparkSqlParser#emptyStatement.
+SparkSqlListener.prototype.enterEmptyStatement = function(ctx) {
+};
+
+// Exit a parse tree produced by SparkSqlParser#emptyStatement.
+SparkSqlListener.prototype.exitEmptyStatement = function(ctx) {
+};
+
+
 // Enter a parse tree produced by SparkSqlParser#singleExpression.
 SparkSqlListener.prototype.enterSingleExpression = function(ctx) {
 };

src/lib/spark/SparkSqlVisitor.js

@@ -24,6 +24,12 @@ SparkSqlVisitor.prototype.visitSingleStatement = function(ctx) {
 };
 
 
+// Visit a parse tree produced by SparkSqlParser#emptyStatement.
+SparkSqlVisitor.prototype.visitEmptyStatement = function(ctx) {
+  return this.visitChildren(ctx);
+};
+
+
 // Visit a parse tree produced by SparkSqlParser#singleExpression.
 SparkSqlVisitor.prototype.visitSingleExpression = function(ctx) {
   return this.visitChildren(ctx);