hsyuan commented on a change in pull request #1102: [CALCITE-1515] RelBuilder
supports creating TableFunctionScan
URL: https://github.com/apache/calcite/pull/1102#discussion_r264853138
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File path: core/src/main/java/org/apache/calcite/tools/RelBuilder.java
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@@ -1045,6 +1053,69 @@ public RelBuilder snapshot(RexNode period) {
return this;
}
+
+ /**
+ * Gets column mappings of the operator.
+ *
+ * @param op operator instance
+ * @return column mappings associated with this function
+ */
+ private Set<RelColumnMapping> getColumnMappings(SqlOperator op) {
+ SqlReturnTypeInference inference = op.getReturnTypeInference();
+ if (inference == null) {
+ return null;
+ }
+ if (inference instanceof TableFunctionReturnTypeInference) {
+ return ((TableFunctionReturnTypeInference)
inference).getColumnMappings();
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * Create a RexCall to the CURSOR function by ordinal.
+ *
+ * @param ordinal the reference to the relational input
+ * @return RexCall to CURSOR function
+ */
+ public RexNode cursor(int ordinal) {
+ return getRexBuilder().makeCall(SqlStdOperatorTable.CURSOR, getRexBuilder()
+ .makeInputRef(peek(stack.size() - ordinal - 1).getRowType(), ordinal));
+ }
+
+ /**
+ * Creates a {@link TableFunctionScan}.
+ *
+ */
+ public RelBuilder functionScan(SqlOperator operator,
+ Iterable<? extends RexNode> operands) {
+ List<RelNode> inputs = new ArrayList<>();
+ int total = stack.size();
+
+ // Get inputs from operands.
+ for (RexNode operand : operands) {
+ if (operand instanceof RexCall) {
+ if (operand.getKind() == SqlKind.CURSOR) {
+ RexNode node = ((RexCall) operand).getOperands().get(0);
+ assert node instanceof RexInputRef;
+ inputs.add(peek(total - ((RexInputRef) node).getIndex() - 1));
+ }
+ }
+ }
+
+ RexNode call = getRexBuilder()
+ .makeCall(operator, ImmutableList.copyOf(operands));
Review comment:
You don't need to add make immutable copy. The RexCall constructor will do.
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