marton-bod commented on a change in pull request #2137:
URL: https://github.com/apache/hive/pull/2137#discussion_r609515251
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File path:
iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergStorageHandler.java
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@@ -250,4 +298,74 @@ static void overlayTableProperties(Configuration
configuration, TableDesc tableD
// this is an exception to the interface documentation, but it's a safe
operation to add this property
props.put(InputFormatConfig.TABLE_SCHEMA, schemaJson);
}
+
+ /**
+ * Recursively collects the column names from the predicate.
+ * @param node The node we are traversing
+ * @param columns The already collected column names
+ */
+ private void columns(ExprNodeDesc node, Collection<String> columns) {
+ if (node instanceof ExprNodeColumnDesc) {
+ columns.add(((ExprNodeColumnDesc) node).getColumn());
+ } else {
+ List<ExprNodeDesc> children = node.getChildren();
+ if (children != null && !children.isEmpty()) {
+ children.forEach(child -> columns(child, columns));
+ }
+ }
+ }
+
+ /**
+ * Recursively replaces the ExprNodeDynamicListDesc nodes by a dummy
ExprNodeConstantDesc so we can test if we can
+ * convert the predicate to an Iceberg predicate when pruning the partitions
later. Please make sure that it is ok
Review comment:
I'm not entirely sure I understand why this dummy replacement is needed
to convert the predicate to an Iceberg predicate. Can you elaborate a little
bit (maybe in the javadoc too)? Apologies if it's obvious, I'm just not that
knowledgeable on partition pruning & co. and I'm assuming some of the future
maintainers of this code might not be either
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