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https://issues.apache.org/jira/browse/HIVE-24534?focusedWorklogId=537340&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-537340
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ASF GitHub Bot logged work on HIVE-24534:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 18/Jan/21 11:22
Start Date: 18/Jan/21 11:22
Worklog Time Spent: 10m
Work Description: zabetak commented on a change in pull request #1780:
URL: https://github.com/apache/hive/pull/1780#discussion_r559496100
##########
File path: ql/src/test/results/clientpositive/llap/avrotblsjoin.q.out
##########
@@ -71,9 +71,9 @@ POSTHOOK: Input: _dummy_database@_dummy_table
POSTHOOK: Output: default@table1_1
POSTHOOK: Lineage: table1_1.col1 SCRIPT []
POSTHOOK: Lineage: table1_1.col2 SCRIPT []
-WARNING: Comparing a bigint and a string may result in a loss of precision.
-WARNING: Comparing a bigint and a string may result in a loss of precision.
-WARNING: Comparing a bigint and a string may result in a loss of precision.
+WARNING: Comparing string and bigint may result in loss of information.
Review comment:
I changed the message `to loss of information` since precision may not
make sense for certain types such as string. I don't have a strong preference
though so I can restore the old message.
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Issue Time Tracking
-------------------
Worklog Id: (was: 537340)
Time Spent: 2h (was: 1h 50m)
> Prevent comparisons between characters and decimals types when strict checks
> enabled
> ------------------------------------------------------------------------------------
>
> Key: HIVE-24534
> URL: https://issues.apache.org/jira/browse/HIVE-24534
> Project: Hive
> Issue Type: Task
> Components: HiveServer2
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> When we compare decimal and character types implicit conversions take place
> that can lead to unexpected and surprising results.
> {code:sql}
> create table t_str (str_col string);
> insert into t_str values ('1208925742523269458163819');select * from t_str
> where str_col=1208925742523269479013976;
> {code}
> The SELECT query brings up one row while the filtering value is not the same
> with the one present in the string column of the table. The problem is that
> both types are converted to doubles and due to loss of precision the values
> are deemed equal.
> Even if we change the implicit conversion to use another type (HIVE-24528)
> there are always some cases that may lead to unexpected results.
> The goal of this issue is to prevent comparisons between decimal and
> character types when hive.strict.checks.type.safety is enabled and throw an
> error.
>
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