[jira] [Created] (CALCITE-4967) Support SQL hints for temporal table join

["Jing Zhang (Jira)" <ji...@apache.org>]

Jing Zhang created CALCITE-4967:
-----------------------------------

             Summary: Support SQL hints for temporal table join
                 Key: CALCITE-4967
                 URL: https://issues.apache.org/jira/browse/CALCITE-4967
             Project: Calcite
          Issue Type: New Feature
          Components: core
            Reporter: Jing Zhang


h1. Background
Like hint on join, sometimes we need hint on temporal table join. For example, specify USE_HASH hint on temporal table join like the following sql,

{code:java}
select stream /*+ USE_HASH (orders) */ * from orders join products_temporal
for system_time as of orders.rowtime on orders.productid = products_temporal.productid
{code}

Now, above sql would translate into correlate instead of Join, like the following Tree Node.

{code:java}
LogicalDelta
  LogicalProject(ROWTIME=[$0], PRODUCTID=[$1], ORDERID=[$2], PRODUCTID0=[$3], NAME=[$4], SUPPLIERID=[$5], SYS_START=[$6], SYS_END=[$7])
    LogicalFilter(condition=[=($1, $3)])
      LogicalCorrelate(correlation=[$cor0], joinType=[inner], requiredColumns=[{0}])
        LogicalTableScan(table=[[CATALOG, SALES, ORDERS]])
        LogicalSnapshot(period=[$cor0.ROWTIME])
          LogicalTableScan(table=[[CATALOG, SALES, PRODUCTS_TEMPORAL]])
{code}

However, correlate is not a hintable node now. So I wonder could we extend correlate to be a hintable node?





--
This message was sent by Atlassian Jira
(v8.20.1#820001)