zabetak commented on a change in pull request #1020: [CALCITE-2812] Add
algebraic operators to allow expressing recursive queries (Ruben Quesada Lopez)
URL: https://github.com/apache/calcite/pull/1020#discussion_r258156573
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File path: core/src/main/java/org/apache/calcite/tools/RelBuilder.java
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@@ -1616,6 +1619,58 @@ public RelBuilder minus(boolean all, int n) {
return setOp(all, SqlKind.EXCEPT, n);
}
+ /**
+ * Creates a {@link LogicalDeltaTableScan} of a delta work table (used to
accumulate results in
+ * recursive union operation), using as its row type the top of the stack.
+ * Returns this builder.
+ */
+ public RelBuilder deltaScan(String tableName) {
Review comment:
Since the notion of Delta already exists for the case of streams I would
suggest to use the notion of transient tables for the new operators. For
example deltaScan becomes transientScan, LogicalDeltaTableScan becomes
LogicalTransientTableScan etc.
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