[CALCITE-6346] JdbcAdapter: Cast for dynamic filter arguments is lost

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.36.0
• Component/s: jdbc-adapter
• Assignee: Unassigned
• Reporter: Corvin Kuebler
• Created: 31/Mar/24 12:31
• Updated: 23/Apr/24 09:03

Description

Hey, 

today we encouraged some issues with the jdbc adapter behaviour.

We have a statement like this:

SELECT CASE WHEN CAST(? AS VARCHAR) = CAST(? AS VARCHAR) THEN "NAME" END
FROM "AUTHORS"
The parameters are ["some", 1].

The statement that is pushed via JDBC Adapter looks like this:

SELECT CASE WHEN ? =  ? THEN "NAME" END
FROM "AUTHORS"

The cast in the resulting statement is lost and therefore we get:
ERROR: operator does not exist: character varying = integer Hint: No operator matches the given name and argument types. You might need to add explicit type casts.

As this example is not minimal I was able to reproduce it with the following test in JdbcTests:

  @Test void testFilterPush() {
    CalciteAssert.that()
        .with(CalciteAssert.Config.FOODMART_CLONE)
        .query("SELECT * FROM \"foodmart\".\"sales_fact_1997\"" +
               " WHERE cast(? as varchar) = cast(? as varchar)")
        .planHasSql("SELECT *\n" +
                    "FROM \"foodmart\".\"sales_fact_1997\"\n" +
                    "WHERE cast(? as varchar) = cast(? as varchar)");
  }

The test shows the exact behaviour as it fails with the following:
Caused by: java.sql.SQLSyntaxErrorException: data type cast needed for parameter or null literal in statement [SELECT *
FROM "foodmart"."sales_fact_1997"
WHERE ? = ?

As can be seen in the exception message, the cast is also lost in this scenario

To me it seems like an obvious bug, but maybe I am missing something here.
I hope some1 can help

BR,
Corvin