return implicit query params type into feature flag (#8063)

Author: VPolka

ydb/core/kqp/session_actor/kqp_query_state.h

@@ -67,7 +67,9 @@ class TKqpQueryState : public TNonCopyable {
         , StartedAt(startedAt)
     {
         RequestEv.reset(ev->Release().Release());
-        if (tableServiceConfig.GetEnableImplicitQueryParameterTypes() && !RequestEv->GetYdbParameters().empty()) {
+        bool enableImplicitQueryParameterTypes = tableServiceConfig.GetEnableImplicitQueryParameterTypes() ||
+            AppData()->FeatureFlags.GetEnableImplicitQueryParameterTypes();
+        if (enableImplicitQueryParameterTypes && !RequestEv->GetYdbParameters().empty()) {
             QueryParameterTypes = std::make_shared<std::map<TString, Ydb::Type>>();
             for (const auto& [name, typedValue] : RequestEv->GetYdbParameters()) {
                 QueryParameterTypes->insert({name, typedValue.Gettype()});

ydb/core/protos/feature_flags.proto

@@ -105,7 +105,7 @@ message TFeatureFlags {
     optional bool EnableSeparationComputeActorsFromRead = 90 [default = false];
     optional bool EnablePQConfigTransactionsAtSchemeShard = 91 [default = false];
     optional bool EnableScriptExecutionOperations = 92 [default = true];
-    reserved 93; // optional bool EnableImplicitQueryParameterTypes = 93 [default = false];
+    optional bool EnableImplicitQueryParameterTypes = 93 [default = false];
     optional bool EnableForceImmediateEffectsExecution = 94 [default = false];
     optional bool EnableTopicSplitMerge = 95 [default = false];
     optional bool EnableChangefeedDynamoDBStreamsFormat = 96 [default = true];