[jira] [Created] (CALCITE-3343) Improve LogicalTableFunctionScan to match table function windowing

["Rui Wang (Jira)" <ji...@apache.org>]

Rui Wang created CALCITE-3343:
---------------------------------

             Summary: 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


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 internals (RexLiteral) to this parameter. 




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