CreateQuery 03578_rocksdb_nullable (children 3)
 Identifier 03578_rocksdb_nullable
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UInt16
   ColumnDeclaration val (children 1)
    DataType String
 Storage definition (children 2)
  Function EmbeddedRocksDB (children 1)
   ExpressionList
  Identifier key
