CreateQuery t_map_lc (children 3)
 Identifier t_map_lc
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration kv (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType LowCardinality (children 1)
       ExpressionList (children 1)
        DataType String
      DataType LowCardinality (children 1)
       ExpressionList (children 1)
        DataType String
   ColumnDeclaration k (children 2)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType LowCardinality (children 1)
       ExpressionList (children 1)
        DataType String
    Function mapKeys (children 1)
     ExpressionList (children 1)
      Identifier kv
   ColumnDeclaration v (children 2)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType LowCardinality (children 1)
       ExpressionList (children 1)
        DataType String
    Function mapValues (children 1)
     ExpressionList (children 1)
      Identifier kv
 Storage definition (children 1)
  Function Memory
