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Rename columns #177

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Rename columns #177

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32ee17f
Whatever
idontgetoutmuch Jul 4, 2023
22265f7
MonadFail
idontgetoutmuch Jul 9, 2023
00b8e26
Anthony Cowley's suggestion
idontgetoutmuch Jul 10, 2023
c5dbc5a
A function to rename columns
idontgetoutmuch Jul 20, 2023
f901c90
Undo accidental commit
idontgetoutmuch Jul 20, 2023
68702b3
Undo accidental commit
idontgetoutmuch Jul 20, 2023
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13 changes: 13 additions & 0 deletions src/Frames/Melt.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,19 @@ type family RDeleteAll ss ts where
RDeleteAll '[] ts = ts
RDeleteAll (s ': ss) ts = RDeleteAll ss (RDelete s ts)

transform :: forall rs as bs . (as ⊆ rs, RDeleteAll as rs ⊆ rs)
=> (Record as -> Record bs) -> Record rs -> Record (RDeleteAll as rs ++ bs)
transform f xs = rcast @(RDeleteAll as rs) xs `rappend` f (rcast xs)

-- | Rename a column
retypeColumn :: forall x y rs . ( V.KnownField x
, V.KnownField y
, V.Snd x ~ V.Snd y
, ElemOf rs x
, RDelete x rs ⊆ rs)
=> Record rs -> Record (RDelete x rs V.++ '[y])
retypeColumn = transform @rs @'[x] @'[y] (\r -> (rgetField @x r &: V.RNil))

-- | This is 'melt', but the variables are at the front of the record,
-- which reads a bit odd.
meltRow' :: forall proxy vs ts ss. (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts,
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