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https://issues.apache.org/jira/browse/HIVE-21289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17062605#comment-17062605
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David Mollitor commented on HIVE-21289:
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[~kgyrtkirk] [~jcamachorodriguez] Are you able to take a peek at this?
> Expect EQ and LIKE to Generate the Identical Explain Plans
> ----------------------------------------------------------
>
> Key: HIVE-21289
> URL: https://issues.apache.org/jira/browse/HIVE-21289
> Project: Hive
> Issue Type: Improvement
> Components: CBO, Logical Optimizer
> Affects Versions: 2.3.4
> Reporter: David Mollitor
> Priority: Minor
>
> I generated some test data with the UUID function.
> {code:sql}
> explain select * from test_like where a like
> 'abce6254-d437-426b-8873-2cbc153ddfbc';
> explain select * from test_like where a =
> 'abce6254-d437-426b-8873-2cbc153ddfbc';
> {code}
> {code}
> Explain
> STAGE DEPENDENCIES:
> Stage-1 is a root stage
> Stage-0 depends on stages: Stage-1
> STAGE PLANS:
> Stage: Stage-1
> Map Reduce
> Map Operator Tree:
> TableScan
> alias: test_like
> filterExpr: (a like 'abce6254-d437-426b-8873-2cbc153ddfbc')
> (type: boolean)
> Statistics: Num rows: 262144 Data size: 9437184 Basic stats:
> COMPLETE Column stats: NONE
> Filter Operator
> predicate: (a like 'abce6254-d437-426b-8873-2cbc153ddfbc')
> (type: boolean)
> Statistics: Num rows: 131072 Data size: 4718592 Basic stats:
> COMPLETE Column stats: NONE
> Select Operator
> expressions: a (type: string)
> outputColumnNames: _col0
> Statistics: Num rows: 131072 Data size: 4718592 Basic stats:
> COMPLETE Column stats: NONE
> File Output Operator
> compressed: false
> Statistics: Num rows: 131072 Data size: 4718592 Basic
> stats: COMPLETE Column stats: NONE
> table:
> input format: org.apache.hadoop.mapred.TextInputFormat
> output format:
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
> serde:
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> Stage: Stage-0
> Fetch Operator
> limit: -1
> Processor Tree:
> ListSink
> {code}
> {code}
> Explain
> STAGE DEPENDENCIES:
> Stage-1 is a root stage
> Stage-0 depends on stages: Stage-1
> STAGE PLANS:
> Stage: Stage-1
> Map Reduce
> Map Operator Tree:
> TableScan
> alias: test_like
> filterExpr: (a = 'abce6254-d437-426b-8873-2cbc153ddfbc') (type:
> boolean)
> Statistics: Num rows: 262144 Data size: 9437184 Basic stats:
> COMPLETE Column stats: NONE
> Filter Operator
> predicate: (a = 'abce6254-d437-426b-8873-2cbc153ddfbc') (type:
> boolean)
> Statistics: Num rows: 131072 Data size: 4718592 Basic stats:
> COMPLETE Column stats: NONE
> Select Operator
> expressions: 'abce6254-d437-426b-8873-2cbc153ddfbc' (type:
> string)
> outputColumnNames: _col0
> Statistics: Num rows: 131072 Data size: 4718592 Basic stats:
> COMPLETE Column stats: NONE
> File Output Operator
> compressed: false
> Statistics: Num rows: 131072 Data size: 4718592 Basic
> stats: COMPLETE Column stats: NONE
> table:
> input format: org.apache.hadoop.mapred.TextInputFormat
> output format:
> org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
> serde:
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> Stage: Stage-0
> Fetch Operator
> limit: -1
> Processor Tree:
> ListSink
> {code}
> They may be the same under the covers, but I would expect the EXPLAIN plan to
> be exactly the same.
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