Add external_data_channels_count create table feature (SQL part)

Can I use your `soroka` for push YQL part of a new feature for YDB, please?

[There](https://github.com/ydb-platform/ydb/pull/21672) is the original PR approved  by Fomichev an Puchin which can't be committed directly to YDB github.

Type: feature
Component: yql

---
Co-authored-by: Tony-Romanov [[email protected]]

Pull Request resolved: https://github.com/ytsaurus/ytsaurus/pull/1414
commit_hash:c98a7b656a050b09976f22f1470ba0ab5bbb52c2

1 files changed, 9 insertions, 0 deletions

diff --git a/yql/essentials/sql/v1/sql_translation.cpp b/yql/essentials/sql/v1/sql_translation.cpp
index 4814f336eff..d6a420949c3 100644
--- a/yql/essentials/sql/v1/sql_translation.cpp
+++ b/yql/essentials/sql/v1/sql_translation.cpp
@@ -2394,6 +2394,15 @@ bool TSqlTranslation::StoreTableSettingsEntry(const TIdentifier& id, const TRule
             Ctx_.Error() << to_upper(id.Name) << " value should be an identifier";
             return false;
         }
+    } else if (to_lower(id.Name) == "external_data_channels_count") {
+        if (reset) {
+            Ctx_.Error() << to_upper(id.Name) << " reset is not supported";
+            return false;
+        }
+        if (!StoreInt(*value, settings.ExternalDataChannelsCount, Ctx_)) {
+            Ctx_.Error() << to_upper(id.Name) << " value should be an integer";
+            return false;
+        }
     } else {
         Ctx_.Error() << "Unknown table setting: " << id.Name;
         return false;