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https://issues.apache.org/jira/browse/IMPALA-9432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-9432:
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Component/s: (was: Planner)
> An "is not distinct from constant" predicate should be converted to = in the
> expression rewrites
> ------------------------------------------------------------------------------------------------
>
> Key: IMPALA-9432
> URL: https://issues.apache.org/jira/browse/IMPALA-9432
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 3.3.0
> Reporter: Wenzhe Zhou
> Priority: Major
>
> In following query, "l_orderkey is not distinct from 1" should be converted
> as "l_orderkey = 1" in expression rewrite.
> select count(*) from tpch_kudu.lineitem where l_orderkey is not distinct from
> 1 and l_partkey = 1 and l_suppkey = 1;
> Here is the current plan.
> ---- PLAN
> PLAN-ROOT SINK
> |
> 01:AGGREGATE [FINALIZE]
> | output: count(*)
> | row-size=8B cardinality=1
> |
> 00:SCAN KUDU [tpch_kudu.lineitem]
> predicates: l_orderkey IS NOT DISTINCT FROM 1
> kudu predicates: l_partkey = 1, l_suppkey = 1
> row-size=8B cardinality=1
> ---- SCANRANGELOCATIONS
> NODE 0:
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [0]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [1]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [2]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [3]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [4]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [5]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [6]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [7]}
> ScanToken\{table-name=impala::tpch_kudu.lineitem, hash-partition-buckets:
> [8]}
> ---- DISTRIBUTEDPLAN
> PLAN-ROOT SINK
> |
> 03:AGGREGATE [FINALIZE]
> | output: count:merge(*)
> | row-size=8B cardinality=1
> |
> 02:EXCHANGE [UNPARTITIONED]
> |
> 01:AGGREGATE
> | output: count(*)
> | row-size=8B cardinality=1
> |
> 00:SCAN KUDU [tpch_kudu.lineitem]
> predicates: l_orderkey IS NOT DISTINCT FROM 1
> kudu predicates: l_partkey = 1, l_suppkey = 1
> row-size=8B cardinality=1
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