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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5364) Planner inserts sort for simple constant value query
Date Fri, 17 Mar 2017 17:17:42 GMT
Paul Rogers created DRILL-5364:
----------------------------------

             Summary: Planner inserts sort for simple constant value query
                 Key: DRILL-5364
                 URL: https://issues.apache.org/jira/browse/DRILL-5364
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.10.0
            Reporter: Paul Rogers


Consider the following query:

{code}
SELECT CURRENT_TIMESTAMP FROM (VALUES(1))
{code}

The following is the plan generated for the query. Notice the inclusion of an unnecessary
sort.

{code}
  "graph" : [ {
    "pop" : "Values",
    "@id" : 4,
    "content" : [ {
      "EXPR$0" : {
        "$numberLong" : 1
      }
    } ],
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000,
    "cost" : 1.0
  }, {
    "pop" : "project",
    "@id" : 3,
    "exprs" : [ {
      "ref" : "`CURRENT_TIMESTAMP`",
      "expr" : "current_timestamp() "
    } ],
    "child" : 4,
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000,
    "cost" : 1.0
  }, {
    "pop" : "external-sort",
    "@id" : 2,
    "child" : 3,
    "orderings" : [ {
      "order" : "ASC",
      "expr" : "`CURRENT_TIMESTAMP`",
      "nullDirection" : "UNSPECIFIED"
    } ],
    "reverse" : false,
    "initialAllocation" : 20000000,
    "maxAllocation" : 10000000000,
    "cost" : 1.0
  }, {
    "pop" : "selection-vector-remover",
    "@id" : 1,
    "child" : 2,
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000,
    "cost" : 1.0
  }, {
    "pop" : "screen",
    "@id" : 0,
    "child" : 1,
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000,
    "cost" : 1.0
  } ]
{code}



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