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https://issues.apache.org/jira/browse/HIVE-21539?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vineet Garg updated HIVE-21539:
-------------------------------
Status: Patch Available (was: Open)
> GroupBy + where clause on same column results in incorrect query rewrite
> ------------------------------------------------------------------------
>
> Key: HIVE-21539
> URL: https://issues.apache.org/jira/browse/HIVE-21539
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 4.0.0
> Reporter: anishek
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-21539.1.patch, HIVE-21539.2.patch,
> HIVE-21539.3.patch
>
>
> {code}
> create table a (i int, j string);
> insert into a values ( 1, 'a'),(2,'b');
> explain extended select min(j) from a where j='a' group by j;
> +----------------------------------------------------+
> | Explain |
> +----------------------------------------------------+
> | OPTIMIZED SQL: SELECT MIN(TRUE) AS `_o__c0` |
> | FROM `default`.`a` |
> | WHERE `j` = 'a' |
> | GROUP BY TRUE |
> | STAGE DEPENDENCIES: |
> | Stage-1 is a root stage |
> | Stage-0 depends on stages: Stage-1 |
> | |
> | STAGE PLANS: |
> | Stage: Stage-1 |
> | Tez |
> | DagId:
> anagarwal_20190318153535_25c1f460-1986-475e-9995-9f6342029dd8:11 |
> | Edges: |
> | Reducer 2 <- Map 1 (SIMPLE_EDGE) |
> | DagName:
> anagarwal_20190318153535_25c1f460-1986-475e-9995-9f6342029dd8:11 |
> | Vertices: |
> | Map 1 |
> | Map Operator Tree: |
> | TableScan |
> | alias: a |
> | filterExpr: (j = 'a') (type: boolean) |
> | Statistics: Num rows: 2 Data size: 170 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | GatherStats: false |
> | Filter Operator |
> | isSamplingPred: false |
> | predicate: (j = 'a') (type: boolean) |
> | Statistics: Num rows: 1 Data size: 85 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | Select Operator |
> | Statistics: Num rows: 1 Data size: 85 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | Group By Operator |
> | aggregations: min(true) |
> | keys: true (type: boolean) |
> | mode: hash |
> | outputColumnNames: _col0, _col1 |
> | Statistics: Num rows: 1 Data size: 8 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | Reduce Output Operator |
> | key expressions: _col0 (type: boolean) |
> | null sort order: a |
> | sort order: + |
> | Map-reduce partition columns: _col0 (type:
> boolean) |
> | Statistics: Num rows: 1 Data size: 8 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | tag: -1 |
> | value expressions: _col1 (type: boolean) |
> | auto parallelism: true |
> | Path -> Alias: |
> | hdfs://localhost:9000/tmp/hive/warehouse/a [a] |
> | Path -> Partition: |
> | hdfs://localhost:9000/tmp/hive/warehouse/a |
> | Partition |
> | base file name: a |
> | input format: org.apache.hadoop.mapred.TextInputFormat |
> | output format:
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
> | properties: |
> | COLUMN_STATS_ACCURATE
> {"BASIC_STATS":"true","COLUMN_STATS":{"i":"true","j":"true"}} |
> | bucket_count -1 |
> | bucketing_version 2 |
> | column.name.delimiter , |
> | columns i,j |
> | columns.comments |
> | columns.types int:string |
> | file.inputformat
> org.apache.hadoop.mapred.TextInputFormat |
> | file.outputformat
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
> | location hdfs://localhost:9000/tmp/hive/warehouse/a |
> | name default.a |
> | numFiles 3 |
> | numRows 2 |
> | rawDataSize 6 |
> | serialization.ddl struct a { i32 i, string j} |
> | serialization.format 1 |
> | serialization.lib
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
> | totalSize 16 |
> | transient_lastDdlTime 1552903148 |
> | serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> |
> | |
> | input format: org.apache.hadoop.mapred.TextInputFormat |
> | output format:
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
> | properties: |
> | COLUMN_STATS_ACCURATE
> {"BASIC_STATS":"true","COLUMN_STATS":{"i":"true","j":"true"}} |
> | bucket_count -1 |
> | bucketing_version 2 |
> | column.name.delimiter , |
> | columns i,j |
> | columns.comments |
> | columns.types int:string |
> | file.inputformat
> org.apache.hadoop.mapred.TextInputFormat |
> | file.outputformat
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat |
> | location hdfs://localhost:9000/tmp/hive/warehouse/a |
> | name default.a |
> | numFiles 3 |
> | numRows 2 |
> | rawDataSize 6 |
> | serialization.ddl struct a { i32 i, string j} |
> | serialization.format 1 |
> | serialization.lib
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
> | totalSize 16 |
> | transient_lastDdlTime 1552903148 |
> | serde:
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
> | name: default.a |
> | name: default.a |
> | Truncated Path -> Alias: |
> +----------------------------------------------------+
> | Explain |
> +----------------------------------------------------+
> | /a [a] |
> | Reducer 2 |
> | Needs Tagging: false |
> | Reduce Operator Tree: |
> | Group By Operator |
> | aggregations: min(VALUE._col0) |
> | keys: KEY._col0 (type: boolean) |
> | mode: mergepartial |
> | outputColumnNames: _col0, _col1 |
> | Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE
> Column stats: COMPLETE |
> | Select Operator |
> | expressions: _col1 (type: boolean) |
> | outputColumnNames: _col0 |
> | Statistics: Num rows: 1 Data size: 4 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | File Output Operator |
> | compressed: false |
> | GlobalTableId: 0 |
> | directory:
> hdfs://localhost:9000/tmp/hive/anagarwal/20f7b890-606b-4815-a56e-ab3384ef58f5/hive_2019-03-18_15-35-35_644_3057456177912469405-1/-mr-10001/.hive-staging_hive_2019-03-18_15-35-35_644_3057456177912469405-1/-ext-10002
> |
> | NumFilesPerFileSink: 1 |
> | Statistics: Num rows: 1 Data size: 4 Basic stats:
> COMPLETE Column stats: COMPLETE |
> | Stats Publishing Key Prefix:
> hdfs://localhost:9000/tmp/hive/anagarwal/20f7b890-606b-4815-a56e-ab3384ef58f5/hive_2019-03-18_15-35-35_644_3057456177912469405-1/-mr-10001/.hive-staging_hive_2019-03-18_15-35-35_644_3057456177912469405-1/-ext-10002/
> |
> | table: |
> | input format:
> org.apache.hadoop.mapred.SequenceFileInputFormat |
> | output format:
> org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat |
> | properties: |
> | columns _col0 |
> | columns.types boolean |
> | escape.delim \ |
> |
> hive.serialization.extend.additional.nesting.levels true |
> | serialization.escape.crlf true |
> | serialization.format 1 |
> | serialization.lib
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
> | serde:
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe |
> | TotalFiles: 1 |
> | GatherStats: false |
> | MultiFileSpray: false |
> | |
> | Stage: Stage-0 |
> | Fetch Operator |
> | limit: -1 |
> | Processor Tree: |
> | ListSink |
> | |
> +----------------------------------------------------+
> {code}
> query is rewritten with *true* as the column value.
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