CreateQuery collapsing_table (children 3)
 Identifier collapsing_table
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value (children 1)
    DataType UInt64
   ColumnDeclaration Sign (children 1)
    DataType Int8
 Storage definition (children 3)
  Function CollapsingMergeTree (children 1)
   ExpressionList (children 1)
    Identifier Sign
  Identifier key
  Set
