Hanumath Rao Maduri created DRILL-6844: ------------------------------------------
Summary: Query with ORDER BY DESC on indexed column does not pick secondary index Key: DRILL-6844 URL: https://issues.apache.org/jira/browse/DRILL-6844 Project: Apache Drill Issue Type: Bug Components: Query Planning & Optimization Affects Versions: 1.14.0 Reporter: Hanumath Rao Maduri Assignee: Hanumath Rao Maduri Query with ORDER BY DESC on indexed column does not pick secondary index {noformat} // Query that uses the secondary index defined on ts. 0: jdbc:drill:schema=dfs.tmp> explain plan for . . . . . . . . . . . . . . > select ts from dfs.`/c8/test3` order by ts limit 1; +------+------+ | text | json | +------+------+ | 00-00 Screen 00-01 Project(ts=[$0]) 00-02 SelectionVectorRemover 00-03 Limit(fetch=[1]) 00-04 Scan(table=[[dfs, /c8/test3]], groupscan=[JsonTableGroupScan [ScanSpec=JsonScanSpec [tableName=maprfs:///c8/test3, condition=null, indexName=ts], columns=[`ts`], limit=1, maxwidth=125]]) {noformat} // Same query with ORDER BY ts DESC does not use the secondary index defined on ts. 0: jdbc:drill:schema=dfs.tmp> explain plan for . . . . . . . . . . . . . . > select ts from dfs.`/c8/test3` order by ts desc limit 1; +------+------+ | text | json | +------+------+ | 00-00 Screen 00-01 Project(ts=[$0]) 00-02 SelectionVectorRemover 00-03 Limit(fetch=[1]) 00-04 SingleMergeExchange(sort0=[0 DESC]) 01-01 OrderedMuxExchange(sort0=[0 DESC]) 02-01 SelectionVectorRemover 02-02 Limit(fetch=[1]) 02-03 SelectionVectorRemover 02-04 TopN(limit=[1]) 02-05 HashToRandomExchange(dist0=[[$0]]) 03-01 Scan(table=[[dfs, /c8/test3]], groupscan=[JsonTableGroupScan [ScanSpec=JsonScanSpec [tableName=maprfs:///c8/test3, condition=null], columns=[`ts`], maxwidth=8554]]) {noformat} { noformat} Index definition is, maprcli table index list -path /c8/test3 -json { "timestamp":1538066303932, "timeofday":"2018-09-27 04:38:23.932 GMT+0000 PM", "status":"OK", "total":2, "data":[ { "cluster":"c8", "type":"maprdb.si", "indexFid":"2176.68.131294", "indexName":"ts", "hashed":false, "indexState":"REPLICA_STATE_REPLICATING", "idx":1, "indexedFields":"ts:ASC", "isUptodate":false, "minPendingTS":1538066077, "maxPendingTS":1538066077, "bytesPending":0, "putsPending":0, "bucketsPending":1, "copyTableCompletionPercentage":100, "numTablets":32, "numRows":80574368, "totalSize":4854052160 }, { "cluster":"c8", "type":"maprdb.si", "indexFid":"2176.72.131302", "indexName":"ts_desc", "hashed":false, "indexState":"REPLICA_STATE_REPLICATING", "idx":2, "indexedFields":"ts:DESC", "isUptodate":false, "minPendingTS":1538066077, "maxPendingTS":1538066077, "bytesPending":0, "putsPending":0, "bucketsPending":1, "copyTableCompletionPercentage":100, "numTablets":32, "numRows":80081344, "totalSize":4937154560 } ] } {noformat} -- This message was sent by Atlassian JIRA (v7.6.3#76005)