[GitHub] [calcite] wangjie-fourth commented on a change in pull request #2332: [CALCITE-4474] SqlSimpleParser inner Tokenizer should not recognize the sql of TokenType.ID or some keywords in some case

[GitBox <gi...@apache.org>]

wangjie-fourth commented on a change in pull request #2332:
URL: https://github.com/apache/calcite/pull/2332#discussion_r563278326



##########
File path: core/src/test/java/org/apache/calcite/sql/test/SqlAdvisorTest.java
##########
@@ -1585,4 +1587,47 @@ private void testSimpleParserQuotedIdImpl() {
     assertSimplify(sql, simplified);
     assertComplete(sql, EXPR_KEYWORDS, Collections.singletonList("TABLE(a)"), DEPT_COLUMNS);
   }
+
+
+  @Test public void testFilterComment() {
+    // SqlSimpleParser.Tokenizer#nextToken() lines 401 - 423
+    // is used to recognize the sql of TokenType.ID or some keywords
+    // if a certain segment of characters is continuously composed of Token,
+    // the function of this code may be wrong
+    // E.g :
+    // (1)select * from a where price> 10.0--comment
+    // 【10.0--comment】should be recognize as TokenType.ID("10.0") and TokenType.COMMENT
+    // but it recognize as TokenType.ID("10.0--comment")
+    // (2)select * from a where column_b='/* this is not comment */'
+    // 【/* this is not comment */】should be recognize as
+    // TokenType.SQID("/* this is not comment */"), but it was not
+
+    final String baseOriginSql = "select * from a ";
+    final String baseResultSql = "SELECT * FROM a ";
+    String originSql;
+
+    // when SqlSimpleParser.Tokenizer#nextToken() method parse sql,
+    // ignore the  "--" after 10.0, this is a comment,
+    // but Tokenizer#nextToken() does not recognize it
+    originSql = baseOriginSql + "where price > 10.0-- this is comment "
+        + System.lineSeparator() + " -- comment ";
+    filterCommentHelper(originSql, baseResultSql + "WHERE price > 10.0");
+
+    originSql = baseOriginSql + "where column_b='/* this is not comment */'";
+    filterCommentHelper(originSql, baseResultSql + "WHERE column_b= '/* this is not comment */'");
+
+    originSql = baseOriginSql + "where column_b='2021 --this is not comment'";
+    filterCommentHelper(originSql, baseResultSql + "WHERE column_b= '2021 --this is not comment'");
+
+    originSql = baseOriginSql + "where column_b='2021--this is not comment'";
+    filterCommentHelper(originSql, baseResultSql + "WHERE column_b= '2021--this is not comment'");
+  }
+
+  private void filterCommentHelper(String originSql, String expectedSql) {

Review comment:
       thanks, it is done




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