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https://issues.apache.org/jira/browse/HIVE-21818?focusedWorklogId=255442&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-255442
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ASF GitHub Bot logged work on HIVE-21818:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 06/Jun/19 21:06
Start Date: 06/Jun/19 21:06
Worklog Time Spent: 10m
Work Description: jcamachor commented on pull request #663: HIVE-21818
URL: https://github.com/apache/hive/pull/663#discussion_r291371794
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File path: ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java
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@@ -2105,7 +2105,13 @@ private void getMetaData(QB qb, ReadEntity parentInput)
Table tab = getTableObjectByName(tabName, false);
if (tab != null) {
// do a deep copy, in case downstream changes it.
Review comment:
The constraints are not deep copied though, you are right. Those should not
change in any case; I will change the comment accordingly.
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Issue Time Tracking
-------------------
Worklog Id: (was: 255442)
Time Spent: 1h 50m (was: 1h 40m)
> CBO: Copying TableRelOptHiveTable has metastore traffic
> -------------------------------------------------------
>
> Key: HIVE-21818
> URL: https://issues.apache.org/jira/browse/HIVE-21818
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Gopal V
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21818.01.patch, HIVE-21818.02.patch,
> HIVE-21818.03.patch, HIVE-21818.04.patch, HIVE-21818.04.patch,
> HIVE-21818.05.patch, HIVE-21818.05.patch, HIVE-21818.05.patch,
> HIVE-21818.patch
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> While the optimizer is running, whenever it makes a copy of the TableScan to
> perform potential rewrites, there is Hive metastore traffic from inside CBO
> optimizer.
> {code}
> public RelOptHiveTable(RelOptSchema calciteSchema, RelDataTypeFactory
> typeFactory, List<String> qualifiedTblName,
> RelDataType rowType, Table hiveTblMetadata, List<ColumnInfo>
> hiveNonPartitionCols,
> List<ColumnInfo> hivePartitionCols, List<VirtualColumn>
> hiveVirtualCols, HiveConf hconf,
> Map<String, PrunedPartitionList> partitionCache, Map<String,
> ColumnStatsList> colStatsCache,
> AtomicInteger noColsMissingStats) { ....
> Pair<List<ImmutableBitSet>, List<ImmutableBitSet>> constraintKeys =
> generateKeys();
> this.keys = constraintKeys.left;
> this.nonNullablekeys = constraintKeys.right;
> this.referentialConstraints = generateReferentialConstraints();
> }
> {code}
> This is triggered from the rules as the partition pruner
> {code}
> protected void perform(RelOptRuleCall call, Filter filter,
> HiveTableScan tScan) {
> // Original table
> RelOptHiveTable hiveTable = (RelOptHiveTable) tScan.getTable();
> // Copy original table scan and table
> HiveTableScan tScanCopy = tScan.copyIncludingTable(tScan.getRowType());
> RelOptHiveTable hiveTableCopy = (RelOptHiveTable) tScanCopy.getTable();
> ...
> if (StringUtils.equals(hiveTableCopy.getPartitionListKey(),
> hiveTable.getPartitionListKey())) {
> // Nothing changed, we do not need to produce a new expression
> return;
> }
> {code}
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