chunweilei commented on a change in pull request #1554: [CALCITE-3462] Add
method in RelBuilder for conveniently projecting out expressions
URL: https://github.com/apache/calcite/pull/1554#discussion_r344660105
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File path: core/src/main/java/org/apache/calcite/tools/RelBuilder.java
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@@ -1259,15 +1255,31 @@ public RelBuilder projectPlus(RexNode... nodes) {
return projectPlus(ImmutableList.copyOf(nodes));
}
- /** Creates a {@link Project} of all original fields, plus the given list of
+ /** Creates a {@link Project} of all original fields, plus the given
* expressions. */
public RelBuilder projectPlus(Iterable<RexNode> nodes) {
final ImmutableList.Builder<RexNode> builder = ImmutableList.builder();
return project(builder.addAll(fields()).addAll(nodes).build());
}
- /** Creates a {@link Project} of the given list
- * of expressions, using the given names.
+ /** Creates a {@link Project} of all original fields, minus the given
+ * expressions. */
+ public RelBuilder projectMinus(RexNode... expressions) {
+ return projectMinus(ImmutableList.copyOf(expressions));
+ }
+
+ /** Creates a {@link Project} of all original fields, minus the given
+ * expressions. */
+ public RelBuilder projectMinus(Iterable<RexNode> expressions) {
+ List<RexNode> allExpressions = new ArrayList<>(fields());
+ for (RexNode excludeExp : expressions) {
+ allExpressions.remove(excludeExp);
Review comment:
Agree with @danny0405 's comment.
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