[jira] [Created] (HIVE-21289) Expect EQ and LIKE to Generate the Identical Explain Plans

[BELUGA BEHR (JIRA)]

BELUGA BEHR created HIVE-21289:
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             Summary: 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: Logical Optimizer
    Affects Versions: 2.3.4
            Reporter: BELUGA BEHR


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|title=LIKE}
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|title=EQ}
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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