[jira] [Created] (ASTERIXDB-2191) Constant folding for nested Scalar Functions

["Wail Alkowaileet (JIRA)" <ji...@apache.org>]

Wail Alkowaileet created ASTERIXDB-2191:
-------------------------------------------

             Summary: Constant folding for nested Scalar Functions
                 Key: ASTERIXDB-2191
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-2191
             Project: Apache AsterixDB
          Issue Type: Improvement
          Components: COMP - Compiler
            Reporter: Wail Alkowaileet
            Assignee: Wail Alkowaileet


Currently, ConstantFoldingRule ignores functions that have non-constants as their arguments. That can miss some opportunities as below:

* Query:
{noformat}
SELECT t
FROM Tweets as t
WHERE t.x = t.x;
{noformat}

* Plan
{noformat}
distribute result [$$7]
-- DISTRIBUTE_RESULT  |PARTITIONED|
  exchange
  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
    project ([$$7])
    -- STREAM_PROJECT  |PARTITIONED|
      assign [$$7] <- [{"t": $$t}]
      -- ASSIGN  |PARTITIONED|
        project ([$$t])
        -- STREAM_PROJECT  |PARTITIONED|
          select (eq($$8, $$8))
          -- STREAM_SELECT  |PARTITIONED|
            assign [$$8] <- [$$t.getField("x")]
            -- ASSIGN  |PARTITIONED|
              project ([$$t])
              -- STREAM_PROJECT  |PARTITIONED|
                exchange
                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                  data-scan []<-[$$9, $$t] <- TwitterDataverse.Tweets
                  -- DATASOURCE_SCAN  |PARTITIONED|
                    exchange
                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                      empty-tuple-source
                      -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
{noformat}



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)