CreateQuery tab (children 3)
 Identifier tab
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration m1 (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType Float32
      DataType String
   ColumnDeclaration m2 (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType LowCardinality (children 1)
       ExpressionList (children 1)
        DataType String
      DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
