Forbid DefaultValues with block input

commit_hash:471951f3059579994545110e5d381952e3b43a3d

Author: loochek

yt/yql/providers/yt/codec/yt_codec_io.cpp

@@ -1610,6 +1610,9 @@ class TArrowDecoder : public TMkqlReaderImpl::TDecoder {
 
     void HandleTableSwitch() {
         auto& decoder = Specs_.Inputs[TableIndex_];
+        for (auto& defVal : decoder->DefaultValues) {
+            YQL_ENSURE(!defVal, "Default values are not supported by Arrow decoder");
+        }
 
         ColumnConverters_.clear();
         ColumnConverters_.reserve(decoder->FieldsVec.size());
@@ -1795,7 +1798,9 @@ void TMkqlReaderImpl::Next() {
 
     // Unretrieable part
     auto& decoder = *Specs_->Inputs[Decoder_->TableIndex_];
-    if (Specs_->UseSkiff_) {
+    if (Specs_->UseBlockInput_) {
+        return;
+    } else if (Specs_->UseSkiff_) {
         if (decoder.OthersStructIndex && *decoder.OthersStructIndex != Max<ui32>()) {
             items[*decoder.OthersStructIndex] = BuildOthers(decoder, *others);
         }
@@ -1834,9 +1839,7 @@ void TMkqlReaderImpl::Next() {
         }
     }
 
-    if (Decoder_->HandlesSysColumns_) {
-        return;
-    }
+    YQL_ENSURE(!Decoder_->HandlesSysColumns_);
 
     if (decoder.FillSysColumnPath) {
         items[*decoder.FillSysColumnPath] = Specs_->TableNames.at(Decoder_->TableIndex_);

yt/yql/providers/yt/provider/yql_yt_helpers.cpp

@@ -2398,9 +2398,15 @@ bool IsYtTableSuitableForArrowInput(NNodes::TExprBase tableNode, std::function<v
     }
 
     auto rowSpec = TYtTableBaseInfo::GetRowSpec(tableNode);
-    if (rowSpec && !rowSpec->StrictSchema) {
-        unsupportedHandler("can't use arrow input on tables with non-strict schema");
-        return false;
+    if (rowSpec) {
+        if (!rowSpec->StrictSchema) {
+            unsupportedHandler("can't use arrow input on tables with non-strict schema");
+            return false;
+        }
+        if (!rowSpec->DefaultValues.empty()) {
+            unsupportedHandler("can't use arrow input on tables with default values");
+            return false;
+        }
     }
 
     return true;