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Posted to issues@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2019/06/01 01:09:00 UTC
[jira] [Updated] (HIVE-21818) CBO: Copying TableRelOptHiveTable has
metastore traffic
[ https://issues.apache.org/jira/browse/HIVE-21818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gopal V updated HIVE-21818:
---------------------------
Component/s: CBO
> 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
> Priority: Major
>
> 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();
> {code}
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