Prefix vector impl table has its own settings (#18132)

Author: azevaykin

src/api/protos/ydb_table.proto

@@ -109,6 +109,7 @@ message GlobalUniqueIndex {
 message GlobalVectorKMeansTreeIndex {
     GlobalIndexSettings level_table_settings = 1;
     GlobalIndexSettings posting_table_settings = 2;
+    GlobalIndexSettings prefix_table_settings = 4;
     KMeansTreeSettings vector_settings = 3;
 }
 

src/client/table/table.cpp

@@ -2531,6 +2531,10 @@ TIndexDescription TIndexDescription::FromProto(const TProto& proto) {
         const auto &vectorProto = proto.global_vector_kmeans_tree_index();
         globalIndexSettings.emplace_back(TGlobalIndexSettings::FromProto(vectorProto.level_table_settings()));
         globalIndexSettings.emplace_back(TGlobalIndexSettings::FromProto(vectorProto.posting_table_settings()));
+        const bool prefixVectorIndex = indexColumns.size() > 1;
+        if (prefixVectorIndex) {
+            globalIndexSettings.emplace_back(TGlobalIndexSettings::FromProto(vectorProto.prefix_table_settings()));
+        }
         specializedIndexSettings = TKMeansTreeSettings::FromProto(vectorProto.vector_settings());
         break;
     }