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Posted to dev@drill.apache.org by "Sean Hsuan-Yi Chu (JIRA)" <ji...@apache.org> on 2015/01/05 18:47:35 UTC
[jira] [Resolved] (DRILL-1394) COUNT(*) with UNION subquery returns
two rows
[ https://issues.apache.org/jira/browse/DRILL-1394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Hsuan-Yi Chu resolved DRILL-1394.
--------------------------------------
Resolution: Cannot Reproduce
> COUNT(*) with UNION subquery returns two rows
> ---------------------------------------------
>
> Key: DRILL-1394
> URL: https://issues.apache.org/jira/browse/DRILL-1394
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 0.5.0
> Reporter: Bob Rumsby
> Assignee: Sean Hsuan-Yi Chu
> Priority: Critical
> Fix For: 0.8.0
>
>
> The following COUNT(*) query with a UNION subquery returns two rows, one count for each side of the union. Run by itself, the subquery returns 70000 rows.
> 0: jdbc:drill:> select count(*) from (select trans_id from `clicks/clicks.campaign.json` union all select trans_id from `clicks/clicks.json`);
> +------------+
> | EXPR$0 |
> +------------+
> | 40000 |
> | 30000 |
> +------------+
> 2 rows selected (5.896 seconds)
> 0: jdbc:drill:> explain plan for select count(*) from (select trans_id from `clicks/clicks.campaign.json` union all select trans_id from `clicks/clicks.json`);
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 StreamAgg(group=[{}], EXPR$0=[COUNT()])
> 00-02 Project($f0=[0])
> 00-03 UnionAll(all=[true])
> 00-05 Project(trans_id=[$1])
> 00-07 Scan(groupscan=[EasyGroupScan [selectionRoot=/mapr/demorig/data/nested/clicks/clicks.campaign.json, columns = null]])
> 00-04 Project(trans_id=[$1])
> 00-06 Scan(groupscan=[EasyGroupScan [selectionRoot=/mapr/demorig/data/nested/clicks/clicks.json, columns = null]])
> | {
> "head" : {
> "version" : 1,
> "generator" : {
> "type" : "ExplainHandler",
> "info" : ""
> },
> "type" : "APACHE_DRILL_PHYSICAL",
> "options" : [ ],
> "queue" : 0,
> "resultMode" : "EXEC"
> },
> "graph" : [ {
> "pop" : "fs-scan",
> "@id" : 7,
> "files" : [ "maprfs:/mapr/demorig/data/nested/clicks/clicks.campaign.json" ],
> "storage" : {
> "type" : "file",
> "enabled" : true,
> "connection" : "maprfs:///",
> "workspaces" : {
> "root" : {
> "location" : "/mapr/demorig/data",
> "writable" : false,
> "storageformat" : null
> },
> "nested" : {
> "location" : "/mapr/demorig/data/nested",
> "writable" : true,
> "storageformat" : "parquet"
> },
> "flat" : {
> "location" : "/mapr/demorig/data/flat",
> "writable" : true,
> "storageformat" : "parquet"
> },
> "views" : {
> "location" : "/mapr/demorig/data/views",
> "writable" : true,
> "storageformat" : "parquet"
> },
> "yelp" : {
> "location" : "/mapr/demorig/data/yelp",
> "writable" : true,
> "storageformat" : "json"
> }
> },
> "formats" : {
> "psv" : {
> "type" : "text",
> "extensions" : [ "tbl" ],
> "delimiter" : "|"
> },
> "csv" : {
> "type" : "text",
> "extensions" : [ "csv" ],
> "delimiter" : ","
> },
> "tsv" : {
> "type" : "text",
> "extensions" : [ "tsv" ],
> "delimiter" : "\t"
> },
> "parquet" : {
> "type" : "parquet"
> },
> "json" : {
> "type" : "json"
> }
> }
> },
> "format" : {
> "type" : "json"
> },
> "selectionRoot" : "/mapr/demorig/data/nested/clicks/clicks.campaign.json",
> "cost" : 7876.0
> }, {
> "pop" : "project",
> "@id" : 5,
> "exprs" : [ {
> "ref" : "`trans_id`",
> "expr" : "`trans_id`"
> } ],
> "child" : 7,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 7876.0
> }, {
> "pop" : "fs-scan",
> "@id" : 6,
> "files" : [ "maprfs:/mapr/demorig/data/nested/clicks/clicks.json" ],
> "storage" : {
> "type" : "file",
> "enabled" : true,
> "connection" : "maprfs:///",
> "workspaces" : {
> "root" : {
> "location" : "/mapr/demorig/data",
> "writable" : false,
> "storageformat" : null
> },
> "nested" : {
> "location" : "/mapr/demorig/data/nested",
> "writable" : true,
> "storageformat" : "parquet"
> },
> "flat" : {
> "location" : "/mapr/demorig/data/flat",
> "writable" : true,
> "storageformat" : "parquet"
> },
> "views" : {
> "location" : "/mapr/demorig/data/views",
> "writable" : true,
> "storageformat" : "parquet"
> },
> "yelp" : {
> "location" : "/mapr/demorig/data/yelp",
> "writable" : true,
> "storageformat" : "json"
> }
> },
> "formats" : {
> "psv" : {
> "type" : "text",
> "extensions" : [ "tbl" ],
> "delimiter" : "|"
> },
> "csv" : {
> "type" : "text",
> "extensions" : [ "csv" ],
> "delimiter" : ","
> },
> "tsv" : {
> "type" : "text",
> "extensions" : [ "tsv" ],
> "delimiter" : "\t"
> },
> "parquet" : {
> "type" : "parquet"
> },
> "json" : {
> "type" : "json"
> }
> }
> },
> "format" : {
> "type" : "json"
> },
> "selectionRoot" : "/mapr/demorig/data/nested/clicks/clicks.json",
> "cost" : 5097.0
> }, {
> "pop" : "project",
> "@id" : 4,
> "exprs" : [ {
> "ref" : "`trans_id`",
> "expr" : "`trans_id`"
> } ],
> "child" : 6,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 5097.0
> }, {
> "pop" : "union-all",
> "@id" : 3,
> "children" : [ 5, 4 ],
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 12973.0
> }, {
> "pop" : "project",
> "@id" : 2,
> "exprs" : [ {
> "ref" : "`$f0`",
> "expr" : "0"
> } ],
> "child" : 3,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 12973.0
> }, {
> "pop" : "streaming-aggregate",
> "@id" : 1,
> "child" : 2,
> "keys" : [ ],
> "exprs" : [ {
> "ref" : "`EXPR$0`",
> "expr" : "count(1) "
> } ],
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 1.0
> }, {
> "pop" : "screen",
> "@id" : 0,
> "child" : 1,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 1297.3
> } ]
> } |
> +------------+------------+
> 1 row selected (0.142 seconds)
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