CreateQuery signed_table (children 3)
 Identifier signed_table
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration k (children 1)
    DataType UInt32
   ColumnDeclaration v (children 1)
    DataType String
   ColumnDeclaration s (children 1)
    DataType Int8
 Storage definition (children 2)
  Function CollapsingMergeTree (children 1)
   ExpressionList (children 1)
    Identifier s
  Identifier k
