Revert "Remove broken optimisation in Direct dictionary dictHas implementation"

src/Dictionaries/DirectDictionary.cpp

@@ -171,6 +171,15 @@ ColumnUInt8::Ptr DirectDictionary<dictionary_key_type>::hasKeys(
     auto requested_keys = requested_keys_extractor.extractAllKeys();
     size_t requested_keys_size = requested_keys.size();
 
+    HashMap<KeyType, size_t> requested_key_to_index;
+    requested_key_to_index.reserve(requested_keys_size);
+
+    for (size_t i = 0; i < requested_keys.size(); ++i)
+    {
+        auto requested_key = requested_keys[i];
+        requested_key_to_index[requested_key] = i;
+    }
+
     auto result = ColumnUInt8::create(requested_keys_size, false);
     auto & result_data = result->getData();
 
@@ -196,18 +205,16 @@ ColumnUInt8::Ptr DirectDictionary<dictionary_key_type>::hasKeys(
         {
             auto block_key = block_keys_extractor.extractCurrentKey();
 
-            size_t index;
+            const auto * it = requested_key_to_index.find(block_key);
-            for (index = 0; index < requested_keys_size; ++index)
+            assert(it);
-            {
+
-                if (!result_data[index] && requested_keys[index] == block_key)
+            size_t result_data_found_index = it->getMapped();
-                {
+            /// block_keys_size cannot be used, due to duplicates.
-                    keys_found++;
+            keys_found += !result_data[result_data_found_index];
-                    result_data[index] = true;
+            result_data[result_data_found_index] = true;
 
             block_keys_extractor.rollbackCurrentKey();
         }
-            }
-        }
 
         block_key_columns.clear();
     }

tests/queries/0_stateless/02366_direct_dictionary_dicthas.reference

@@ -1,62 +0,0 @@
-0
-0
-0
-1
-0
-1
-0
-2
-1
-0
-0	0	1
-1	0	1
-2	0	1
-3	1	0
-4	0	1
-5	1	0
-6	0	1
-7	2	0
-8	1	0
-9	0	1
-1
-1
-1
-0
-1
-0
-1
-0
-0
-1
-1
-1
-1
-0
-1
-0
-1
-0
-0
-1
-1
-1
-1
-0
-1
-0
-1
-0
-0
-1
-value_0
-value_0
-value_0
-UNKNOWN
-value_0
-UNKNOWN
-value_0
-UNKNOWN
-UNKNOWN
-value_0
-4	0
-6	1

tests/queries/0_stateless/02366_direct_dictionary_dicthas.sql

@@ -1,56 +0,0 @@
--- Tags: no-backward-compatibility-check
-DROP DATABASE IF EXISTS 02366_dictionary_db;
-CREATE DATABASE 02366_dictionary_db;
-
-CREATE TABLE 02366_dictionary_db.dict_data
-(
-   id UInt64,
-   val String
-)
-ENGINE = Memory;
-
-CREATE TABLE 02366_dictionary_db.lookup_data
-(
-   id UInt64,
-   lookup_key UInt64,
-)
-ENGINE = Memory;
-
-INSERT INTO 02366_dictionary_db.dict_data VALUES(0, 'value_0');
-
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(0, 0);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(1, 0);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(2, 0);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(3, 1);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(4, 0);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(5, 1);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(6, 0);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(7, 2);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(8, 1);
-INSERT INTO 02366_dictionary_db.lookup_data VALUES(9, 0);
-
-CREATE DICTIONARY 02366_dictionary_db.dict0
-(
-   id UInt64,
-   val String
-)
-PRIMARY KEY id
-SOURCE(CLICKHOUSE(HOST 'localhost' PORT tcpPort() USER 'default' TABLE 'dict_data'))
-LAYOUT(DIRECT());
-
-SELECT lookup_key FROM 02366_dictionary_db.lookup_data ORDER BY id ASC;
-SELECT id, lookup_key, dictHas(02366_dictionary_db.dict0, lookup_key) FROM 02366_dictionary_db.lookup_data ORDER BY id ASC;
-
--- Nesting this way seems to help it make all the lookups as a single block, although even then it isn't guaranteed
-SELECT dictHas(02366_dictionary_db.dict0, lk) FROM (SELECT any(lookup_key) as lk FROM 02366_dictionary_db.lookup_data group by id ORDER BY id ASC);
--- Same with this group by
-SELECT dictHas(02366_dictionary_db.dict0, any(lookup_key)) FROM 02366_dictionary_db.lookup_data GROUP BY id ORDER BY id ASC;
-
-
-SELECT dictHas(02366_dictionary_db.dict0, lookup_key) FROM 02366_dictionary_db.lookup_data ORDER BY id ASC;
-SELECT dictGetOrDefault(02366_dictionary_db.dict0, 'val', lookup_key, 'UNKNOWN') FROM 02366_dictionary_db.lookup_data ORDER BY id ASC;
-SELECT count(), has FROM 02366_dictionary_db.lookup_data group by dictHas(02366_dictionary_db.dict0, lookup_key) as has;
-
-DROP DICTIONARY 02366_dictionary_db.dict0;
-DROP TABLE 02366_dictionary_db.lookup_data;
-DROP TABLE 02366_dictionary_db.dict_data;