arina-ielchiieva commented on a change in pull request #1815: DRILL-6711: Use 
jitpack repository for Drill Calcite project artifacts instead of 
repository.mapr.com
URL: https://github.com/apache/drill/pull/1815#discussion_r297602798
 
 

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+# Drill-specific commits in Apache Calcite
+
+Currently, Drill uses Apache Calcite with additional changes, required for 
Drill. All the commits were left after 
+update from Calcite `1.4.0` to Calcite `1.15.0` and weren't merged to the 
Calcite's master yet.
+
+List of Jiras with Drill-specific commits:
+
+|Jira|Summary|The reason why it wasn't merged|
+|----|-------|-------------------------------|
+|[CALCITE-2018](https://issues.apache.org/jira/browse/CALCITE-2018)|Queries 
failed with AssertionError: rel has lower cost than best cost of subset|Pull 
request with the fix was created 
([PR-552](https://github.com/apache/calcite/pull/552)), but an issue which 
blocks it was found and wasn't resolved yet: 
[CALCITE-2166](https://issues.apache.org/jira/browse/CALCITE-2166).|
+|[CALCITE-2087](https://issues.apache.org/jira/browse/CALCITE-2087)|Add new 
method to ViewExpander interface to allow passing SchemaPlus.|Pull request into 
Apache Calcite was created, but it was declined. See conversation in Jira.|
+|[CALCITE-1178](https://issues.apache.org/jira/browse/CALCITE-1178)|Allow 
SqlBetweenOperator to compare DATE and TIMESTAMP|SQL spec does not allow to 
compare datetime types if they have different <primary datetime field>s. 
Therefore Calcite community won’t accept these changes. Similar issues were 
reported in [CALCITE-2829](https://issues.apache.org/jira/browse/CALCITE-2829) 
and in [CALCITE-2745](https://issues.apache.org/jira/browse/CALCITE-2745)|
+
+# Drill-Calcite repository
+
+Repository with source code is placed 
[here](https://github.com/vvysotskyi/drill-calcite). For backward 
+compatibility, some previously used by Drill branches were pushed to this repo.
 
 Review comment:
   ```suggestion
   compatibility, a couple of previous Drill Calcite branches were pushed into 
this repo.
   ```

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