julianhyde commented on a change in pull request #1811: [CALCITE-3789] Support
validation of UNNEST multiple array columns like Presto
URL: https://github.com/apache/calcite/pull/1811#discussion_r404217847
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File path: core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java
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@@ -2219,6 +2207,42 @@ protected void convertFrom(
}
}
+ private List<String> getFieldAliases(SqlCall asCall) {
+ if (!validator.getConformance().allowAliasUnnestColumns()) {
+ return null;
+ }
+
+ List<String> columnAliases = new ArrayList<>();
+ for (SqlNode sqlNode : Util.skip(asCall.getOperandList(), 2)) {
+ columnAliases.add(((SqlIdentifier) sqlNode).getSimple());
+ }
+ return columnAliases;
+ }
+
+ private void convertUnnest(Blackboard bb, SqlCall from, List<String>
fieldAliases) {
+ SqlCall call;
+ call = from;
+ final List<SqlNode> nodes = call.getOperandList();
+ final SqlUnnestOperator operator = (SqlUnnestOperator) call.getOperator();
+ for (SqlNode node : nodes) {
+ replaceSubQueries(bb, node, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
+ }
+ final List<RexNode> exprs = new ArrayList<>();
+ final List<String> fieldNames = new ArrayList<>();
+ for (Ord<SqlNode> node : Ord.zip(nodes)) {
+ exprs.add(bb.convertExpression(node.e));
+ fieldNames.add(validator.deriveAlias(node.e, node.i));
+ }
+ RelNode child =
+ (null != bb.root) ? bb.root : LogicalValues.createOneRow(cluster);
+ relBuilder.push(child).projectNamed(exprs, fieldNames, false);
+
+ Uncollect uncollect =
Review comment:
it's about time we added `RelBuilder.uncollect`
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