Uploaded image for project: 'Calcite'
  1. Calcite
  2. CALCITE-783

Infer collation of Project using monotonicity

VotersWatch issueWatchersLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 1.4.0-incubating
    • core
    • None

    Description

      Current implementation of RelMdCollation#project doesn't handle function expressions and because of that we loose any collation metadata related to monotonic expressions which can be useful for generating streaming query execution plans involving tumbling windows.

      Following is how current code looks like (RelMdCollation):

      185: for (Ord<RexNode> project : Ord.zip(projects)) {
      186: if (project.e instanceof RexInputRef)

      { 187: targets.put(((RexInputRef) project.e).getIndex(), project.i); 188: }


      189: }

      We only handle projects of type RexInputRef. But to support monotonic expressions we should laso handle projects of type RexCall.

      Attachments

        1. CALCITE-783-1.patch
          56 kB
          Milinda Pathirage
        2. CALCITE-783-0.patch
          2 kB
          Milinda Pathirage

        Issue Links

        Activity

          This comment will be Viewable by All Users Viewable by All Users
          Cancel

          People

            julianhyde Julian Hyde
            milinda Milinda Pathirage
            Votes:
            0 Vote for this issue
            Watchers:
            5 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Slack

                Issue deployment