rubenada 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_r255429972
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File path: core/src/main/java/org/apache/calcite/tools/RelBuilder.java
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@@ -1616,6 +1619,68 @@ 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,
and not max depth
+ * Returns this builder.
+ */
+ public RelBuilder deltaScan(String tableName) {
+ return this.deltaScan(tableName, this.peek().getRowType());
+ }
+
+ /**
+ * 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,
and a certain max depth
+ * Returns this builder.
+ */
+ public RelBuilder deltaScan(String tableName, int maxDepth) {
Review comment:
@zabetak you're right, I have committed a new version with a refactoring
using this approach.
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