[jira] [Created] (CALCITE-2674) Column name with escape character should not be verified as a function when the column name is same with it

["Yuzhao Chen (JIRA)" <ji...@apache.org>]

Yuzhao Chen created CALCITE-2674:
------------------------------------

             Summary: Column name with escape character should not be verified as a function when the column name is same with it
                 Key: CALCITE-2674
                 URL: https://issues.apache.org/jira/browse/CALCITE-2674
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.18.0
            Reporter: Yuzhao Chen
            Assignee: Julian Hyde
             Fix For: 1.18.0


If use defines table as schema below:

 
{code:java}
create table tt(
`current_time` int,
b int);
{code}
Then start a query:

 

 
{code:java}
select `current_time` from tt;
{code}
Calcite parser will parse the *current_time* as a normal *SqlIdentifier*, then the SqlValidator will recognize it a a builtin function with below code snippet:
{code:java}
public static SqlCall makeCall(
    SqlOperatorTable opTab,
    SqlIdentifier id) {
  if (id.names.size() == 1) {
    final List<SqlOperator> list = new ArrayList<>();
    opTab.lookupOperatorOverloads(id, null, SqlSyntax.FUNCTION, list);
    for (SqlOperator operator : list) {
      if (operator.getSyntax() == SqlSyntax.FUNCTION_ID) {
        // Even though this looks like an identifier, it is a
        // actually a call to a function. Construct a fake
        // call to this function, so we can use the regular
        // operator validation.
        return new SqlBasicCall(
            operator,
            SqlNode.EMPTY_ARRAY,
            id.getParserPosition(),
            true,
            null);
      }
    }
  }
  return null;
}{code}
While i tried MYSQL and such query can work properly, so is this a bug ? Cause if the matched function return type is same with the column, then the query will output wrong results.

 



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