Details
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New Feature
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Status: Closed
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Major
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Resolution: Fixed
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None
Description
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,
select /*+ USE_HASH (orders) */ stream * from orders join products_temporal for system_time as of orders.rowtime on orders.productid = products_temporal.productid
Now, above sql would translate into correlate instead of Join, like the following Tree Node.
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]])
However, correlate is not a hintable node now and the hint could not be propagated to the correlate nodes.
So I wonder could we extend correlate to be a hintable node?
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