support sql comment

Author: camilesing

gen/.antlr/FlinkSQL.interp

@@ -10,9 +10,11 @@ statement
     ;
 
 sqlStatements
-    : (sqlStatement | emptyStatement)*
+    : (comment | sqlStatement | emptyStatement)*
     ;
 
+comment: LINE_COMMENT | COMMENT_INPUT;
+
 sqlStatement
     : ddlStatement SEMICOLON | dmlStatement SEMICOLON | describeStatement SEMICOLON 
     | explainStatement SEMICOLON | useStatement SEMICOLON | showStatememt SEMICOLON

gen/.antlr/FlinkSQLParser.java

@@ -37,6 +37,7 @@ import { LogicalNestedContext } from "./FlinkSQLParser";
 import { ProgramContext } from "./FlinkSQLParser";
 import { StatementContext } from "./FlinkSQLParser";
 import { SqlStatementsContext } from "./FlinkSQLParser";
+import { CommentContext } from "./FlinkSQLParser";
 import { SqlStatementContext } from "./FlinkSQLParser";
 import { EmptyStatementContext } from "./FlinkSQLParser";
 import { DdlStatementContext } from "./FlinkSQLParser";
@@ -662,6 +663,17 @@ export interface FlinkSQLListener extends ParseTreeListener {
 	 */
 	exitSqlStatements?: (ctx: SqlStatementsContext) => void;
 
+	/**
+	 * Enter a parse tree produced by `FlinkSQLParser.comment`.
+	 * @param ctx the parse tree
+	 */
+	enterComment?: (ctx: CommentContext) => void;
+	/**
+	 * Exit a parse tree produced by `FlinkSQLParser.comment`.
+	 * @param ctx the parse tree
+	 */
+	exitComment?: (ctx: CommentContext) => void;
+
 	/**
 	 * Enter a parse tree produced by `FlinkSQLParser.sqlStatement`.
 	 * @param ctx the parse tree

gen/FlinkSQL.g4

@@ -37,6 +37,7 @@ import { LogicalNestedContext } from "./FlinkSQLParser";
 import { ProgramContext } from "./FlinkSQLParser";
 import { StatementContext } from "./FlinkSQLParser";
 import { SqlStatementsContext } from "./FlinkSQLParser";
+import { CommentContext } from "./FlinkSQLParser";
 import { SqlStatementContext } from "./FlinkSQLParser";
 import { EmptyStatementContext } from "./FlinkSQLParser";
 import { DdlStatementContext } from "./FlinkSQLParser";
@@ -498,6 +499,13 @@ export interface FlinkSQLVisitor<Result> extends ParseTreeVisitor<Result> {
 	 */
 	visitSqlStatements?: (ctx: SqlStatementsContext) => Result;
 
+	/**
+	 * Visit a parse tree produced by `FlinkSQLParser.comment`.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	visitComment?: (ctx: CommentContext) => Result;
+
 	/**
 	 * Visit a parse tree produced by `FlinkSQLParser.sqlStatement`.
 	 * @param ctx the parse tree