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https://issues.apache.org/jira/browse/CALCITE-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Wang closed CALCITE-3343.
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Resolution: Not A Problem
> Improve LogicalTableFunctionScan to match table function windowing
> ------------------------------------------------------------------
>
> Key: CALCITE-3343
> URL: https://issues.apache.org/jira/browse/CALCITE-3343
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
> https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/logical/LogicalTableFunctionScan.java#L40
> {code:java}
> /**
> * Creates a <code>LogicalTableFunctionScan</code>.
> *
> * @param cluster Cluster that this relational expression belongs to
> * @param inputs 0 or more relational inputs
> * @param traitSet Trait set
> * @param rexCall Function invocation expression
> * @param elementType Element type of the collection that will implement
> * this table
> * @param rowType Row type produced by function
> * @param columnMappings Column mappings associated with this function
> */
> public LogicalTableFunctionScan(
> RelOptCluster cluster,
> RelTraitSet traitSet,
> List<RelNode> inputs,
> RexNode rexCall,
> Type elementType,
> RelDataType rowType,
> Set<RelColumnMapping> columnMappings) {
> super(cluster, traitSet, inputs, rexCall, elementType, rowType,
> columnMappings);
> }
> {code}
> There might be a gap to make LogicalTableFunctionScan work for table function
> windowing:
> 1. we need a RexInputRef parameter (converted from the DESCRIPTOR) to mark
> which column is the watermarked column.
> 2. we need a List of RexNode(RexLiteral) for interval parameters.
> The most straightforward approach while maintaining backward compatible,
> seems is add another constructor with an additional List<RexNode> parameter.
> We could save RexInputRef and intervals (RexLiteral) to this parameter.
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