YDB FQ: enable Timestamp pushdown for Generic provider (#14222)

Author: vitalyisaev2

ydb/library/yql/providers/generic/provider/yql_generic_physical_opt.cpp

@@ -27,7 +27,7 @@ namespace NYql {
                 : NPushdown::TSettings(NLog::EComponent::ProviderGeneric)
             {
                 using EFlag = NPushdown::TSettings::EFeatureFlag;
-                Enable(EFlag::ExpressionAsPredicate | EFlag::ArithmeticalExpressions | EFlag::ImplicitConversionToInt64);
+                Enable(EFlag::ExpressionAsPredicate | EFlag::ArithmeticalExpressions | EFlag::ImplicitConversionToInt64 | EFlag::DateTimeTypes | EFlag::TimestampCtor);
             }
         };
 

ydb/library/yql/providers/generic/provider/yql_generic_predicate_pushdown.cpp

@@ -112,6 +112,7 @@ namespace NYql {
             MATCH_TYPE(String, STRING);
             MATCH_TYPE(Utf8, UTF8);
             MATCH_TYPE(Json, JSON);
+            MATCH_TYPE(Timestamp, TIMESTAMP);
 
             ctx.Err << "unknown data slot " << static_cast<ui64>(dataSlot) << " for safe cast";
             return false;