Details
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Improvement
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Status: Open
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Minor
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Resolution: Unresolved
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2.3.4
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None
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None
Description
I generated some test data with the UUID function.
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';
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
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
They may be the same under the covers, but I would expect the EXPLAIN plan to be exactly the same.