Jesus Camacho Rodriguez created HIVE-13806:
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Summary: Extension to folding NOT expressions in CBO
Key: HIVE-13806
URL: https://issues.apache.org/jira/browse/HIVE-13806
Project: Hive
Issue Type: Sub-task
Components: CBO
Affects Versions: 2.1.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Follow-up of HIVE-13068.
Extension to folding expressions for NOT.
Currently, simplification is performed only if NOT is applied on a simple
operation (e.g. IS NOT NULL, =, <>, etc.). We should take advantage of NOT
distributivity when it is applied on OR/AND operations to try to simplify
predicates further.
Ex. ql/src/test/results/clientpositive/folder_predicate.q.out
{noformat}
explain
SELECT * FROM predicate_fold_tb WHERE not(value IS NOT NULL AND value = 3)
{noformat}
Plan:
{noformat}
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: predicate_fold_tb
Statistics: Num rows: 6 Data size: 7 Basic stats: COMPLETE Column
stats: NONE
Filter Operator
predicate: (not (value is not null and (value = 3))) (type:
boolean)
Statistics: Num rows: 3 Data size: 3 Basic stats: COMPLETE Column
stats: NONE
Select Operator
expressions: value (type: int)
outputColumnNames: _col0
Statistics: Num rows: 3 Data size: 3 Basic stats: COMPLETE
Column stats: NONE
File Output Operator
compressed: false
Statistics: Num rows: 3 Data size: 3 Basic stats: COMPLETE
Column stats: NONE
table:
input format:
org.apache.hadoop.mapred.SequenceFileInputFormat
output format:
org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
Stage: Stage-0
Fetch Operator
limit: -1
Processor Tree:
ListSink
{noformat}
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