data Query = Pipe Query Query | Field String | Elements
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
data Query
= Pipe Query Query
| Field String
| Elements
| Select Query
| ConstInt Int
| ConstString String
| Equal Query Query
deriving Show
this is a haskell question:
Executes a 'Query' by translating it into a `Transformer`. Each of the constructors of 'Uery' is turned into its corresponding 'Transformer' .
execute :: Query -> Transformer
execute = (answer here)
sample output:
example:
> execute Elements (Array [Number 1, Number 2])
returns:
> [Number 1, Number 2]
answer in haskell form please.
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