deniskuzZ commented on code in PR #6179:
URL: https://github.com/apache/hive/pull/6179#discussion_r2809468167
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standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/PartFilterExprUtil.java:
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@@ -116,4 +125,59 @@ private static ExpressionTree makeExpressionTree(String
filter) throws MetaExcep
public static ExpressionTree parseFilterTree(String filter) throws
MetaException {
return PartFilterParser.parseFilter(filter);
}
+
+ public static TreeNode buildTreeFromNodes(List<? extends TreeNode> nodes,
LogicalOperator operator) {
+ // The 'nodes' list is expected to have at least one element.
+ // If the list if empty, the lexer parse would have failed.
+ assert !nodes.isEmpty() ;
+ if (nodes.size() == 1) {
+ return nodes.get(0);
+ }
+ TreeNode root = new TreeNode(nodes.get(0), operator, nodes.get(1));
+ for (int i = 2; i < nodes.size(); ++i) {
+ TreeNode tmp = new TreeNode(root, operator, nodes.get(i));
+ root = tmp;
+ }
+ return root;
+ }
+
+ /**
+ * Flatten all AND-connected leaf nodes in the given expression tree
+ * into MultiAndLeafNodes for more efficient evaluation.
+ */
+ public static TreeNode flattenAndExpressions(TreeNode node) {
Review Comment:
should it be under parser module?
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