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https://issues.apache.org/jira/browse/DRILL-5364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers updated DRILL-5364:
-------------------------------
Comment: was deleted
(was: When the query runs, the planner inserts a sort. Because the "legacy"
sort is configured by default, the query uses the unmanaged sort. Somehow,
somewhere in the process, the single row is remove and the result set passed to
the client is empty.
Since this works for other folks, this is very likely a problem unique to an
embedded drillbit, which is what this particular test uses.
The record count going into the legacy sort is 1, but 0 records come out.)
> 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
> Priority: Minor
>
> 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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