Github user hsyuan commented on a diff in the pull request: https://github.com/apache/incubator-hawq/pull/845#discussion_r76369429 --- Diff: src/backend/cdb/cdbdatalocality.c --- @@ -3791,12 +3791,27 @@ run_allocation_algorithm(SplitAllocResult *result, List *virtual_segments, Query targetPolicy = GpPolicyFetch(CurrentMemoryContext, myrelid); bool isRelationHash = is_relation_hash(targetPolicy); + int fileCountInRelation = list_length(rel_data->files); + bool FileCountBucketNumMismatch = false; + if (targetPolicy->bucketnum > 0) { + FileCountBucketNumMismatch = fileCountInRelation % + targetPolicy->bucketnum == 0 ? false : true; + } + if (FileCountBucketNumMismatch && !allow_file_count_bucket_num_mismatch) { + elog(ERROR, "file count %d in catalog is not in proportion to the bucket " + "number %d of hash table with oid=%u, some data may be lost, if you " + "still want to continue the query by considering the table as random, set GUC " --- End diff -- You can force running the query by viewing the table as randomly distributed table. set GUC allow_file_count_bucket_num_mismatch on to enable this feature.
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