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  1. Calcite
  2. CALCITE-1222

DatabaseMetaData.getColumnLabel returns null when query has ORDER BY

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.8.0
    • Component/s: None
    • Labels:
      None

      Description

      Background from the thread here: http://mail-archives.apache.org/mod_mbox/calcite-dev/201604.mbox/%3CCAJU9nmgxyR%2BCXPXXjYkSKRL4%3DUvbN4nD1JMCtiFzAofRrT1Pug%40mail.gmail.com%3E

      Kevin Risden wrote:

      I've been integrating Calcite/Avatica into Solr and ran into a case where
      adding an order by or a limit changes the output of
      DatabaseMetaData.getColumnName and getColumnLabel.

      An example is below:

      Behavior 1 (which I think is correct from reading the JDBC DatabaseMetaData
      spec):

      • select e."name" as full_name from "hr"."emps" as e;
      • getColumnName(1) -> name
      • getColumnLabel(1) -> FULL_NAME

      Behavior 2:

      • select e."name" as full_name from "hr"."emps" as e limit 10;
      • getColumnName(1) -> FULL_NAME
      • getColumnLabel(1) -> FULL_NAME

      I was able to reproduce the behavior with the JdbcExample.java file in the
      master branch of Calcite since I wasn't sure if it was my adapter
      originally.

      I started looking at the SqlParserTest and added this test case which
      doesn't error out.

      /**

      • "LIMIT ... OFFSET ..." is the postgres equivalent of SQL:2008
      • "OFFSET ... FETCH". It all maps down to a parse tree that looks like
      • SQL:2008.
        */
        @Test public void testColumnAliasWithAsWithLimit() {
        check(
        "select a as abc from foo order by b, c limit 2 offset 1",
        "SELECT `A` AS `ABC`\n"
        + "FROM `FOO`\n"
        + "ORDER BY `B`, `C`\n"
        + "OFFSET 1 ROWS\n"
        + "FETCH NEXT 2 ROWS ONLY");
        check(
        "select a as abc from foo order by b, c limit 2",
        "SELECT `A` AS `ABC`\n"
        + "FROM `FOO`\n"
        + "ORDER BY `B`, `C`\n"
        + "FETCH NEXT 2 ROWS ONLY");
        check(
        "select a as abc from foo order by b, c offset 1",
        "SELECT `A` AS `ABC`\n"
        + "FROM `FOO`\n"
        + "ORDER BY `B`, `C`\n"
        + "OFFSET 1 ROWS");

      I'm not sure where to look next to try to find this to submit a patch. Let
      me know if you need more information.

      I think this potentially causes some problems down the line when the
      original name or alias is used for ordering and having, but I haven't been
      able to verify this for sure.

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              • Assignee:
                julianhyde Julian Hyde
                Reporter:
                risdenk Kevin Risden
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                • Created:
                  Updated:
                  Resolved: