Public API: added additional information for compression (#12395)

Author: Vladislav Gogov

ydb/public/api/protos/ydb_table.proto

@@ -543,8 +543,7 @@ message ColumnFamily {
         COMPRESSION_ZSTD = 3;
     }
 
-    // Name of the column family, the name "default" must be used for the
-    // primary column family that contains at least primary key columns
+    // Name of the column family
     string name = 1;
 
     // This specifies data storage settings for column family
@@ -557,8 +556,9 @@ message ColumnFamily {
     // WARNING: DO NOT USE
     Ydb.FeatureFlag.Status keep_in_memory = 4;
 
-    // Not all compression algorithms support
-    // Set if want to change default value
+    // Set the compression level for selected compression type. If no value is specified, default value will be chosen.
+    // For ZSTD compression level must be in range [-131072:22]
+    // For other compression types compression level must be empty
     optional int32 compression_level = 5;
 }