Hui Huang created HIVE-20284:
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Summary: In strict mode, if constant propagation is enable, the
partition filter is folded before partition pruner lead to error "No partition
predicate for Alias"
Key: HIVE-20284
URL: https://issues.apache.org/jira/browse/HIVE-20284
Project: Hive
Issue Type: Improvement
Components: CLI
Affects Versions: 1.2.1, 2.3.3
Reporter: Hui Huang
Assignee: Hui Huang
Fix For: 2.3.3
In strict mode and the hive.optimize.constant.propagation is set to true, the
following sql will failed:
{code:java}
hive> desc employee_part;
OK
col_name data_type comment
eid int
name string
dept string
year string
month string
# Partition Information
# col_name data_type comment
year string
month string
Time taken: 0.564 seconds, Fetched: 11 row(s)
hive> set hive.mapred.mode=strict;
hive> select * from employee_part where false and concat(year,month)='201807';
FAILED: SemanticException Queries against partitioned tables without a
partition filter are disabled for safety reasons. If you know what you are
doing, please sethive.strict.checks.large.query to false and that
hive.mapred.mode is not set to 'strict' to proceed. Note that if you may get
errors or incorrect results if you make a mistake while using some of the
unsafe features. No partition predicate for Alias "employee_part" Table
"employee_part"
{code}
The above error msg is confusing， concat(year,month)='201807' is the partition
filter。
The reason is during logic optimization, the ConstantPropagate optimizer is
running before partitionPruner optimizer, when found a express like 'false and
concat(year,month)=xxxx', the express will replace with 'fasle' and the
partition filter is droped. So the PartitionPruner can not get the partition
filter.
Users can remove the constant express that always has true/false values to work
around.
When views used, if some columns are constant values, users will be confusing.
So we should add some more message in the error msg returned.
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