CreateQuery collapsing_merge_tree (children 3)
 Identifier collapsing_merge_tree
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration key (children 1)
    DataType UInt32
   ColumnDeclaration sign (children 1)
    DataType Int8
   ColumnDeclaration date (children 1)
    DataType Datetime
 Storage definition (children 3)
  Function CollapsingMergeTree (children 1)
   ExpressionList (children 1)
    Identifier sign
  Identifier date
  Identifier key
