Jesus Camacho Rodriguez created CALCITE-1618:
------------------------------------------------
Summary: SortProjectTransposeRule ignores CAST in the Project
operator
Key: CALCITE-1618
URL: https://issues.apache.org/jira/browse/CALCITE-1618
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.11.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Fix For: 1.12.0
For instance:
{noformat}
...
HiveSortLimit(sort0=$4,sort1=$2,dir0=ASC-nulls-first,dir1=DESC-nulls-last,fetch=10)
HiveProject(robot=$0,_o__c1=$2,m=$3,s=$4,(tok_function tok_int
(tok_table_or_col robot))=CAST($0):INTEGER))
...
{noformat}
will be transformed into:
{noformat}
...
HiveProject(robot=$0,_o__c1=$2,m=$3,s=$4,(tok_function tok_int
(tok_table_or_col robot))=CAST($0):INTEGER))
HiveSortLimit(sort0=$0,sort1=$2,dir0=ASC-nulls-first,dir1=DESC-nulls-last,fetch=10)
...
{noformat}
which is incorrect.
The problem seems to be in the _permutation_ method in RelOptUtil, which is
called in L87. The method actually considers a CAST on a reference as a valid
column permutation of the column referenced; probably it should not.
_permutation_ is only called by this rule and UnionPullUpConstantsRule, thus it
seems it is safe to fix the semantics of the method.
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