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Danny Chen commented on CALCITE-4967: ------------------------------------- +1 for the idea. We can made the correlate node hintable though. > 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 > Priority: Major > > 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)