CreateQuery test_partial_index (children 3)
 Identifier test_partial_index
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration event_date (children 1)
    DataType Date
   ColumnDeclaration user_id (children 1)
    DataType UInt32
   ColumnDeclaration url (children 1)
    DataType String
   ColumnDeclaration region (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier event_date
    Identifier id
  Set
