[8.x] ESQL: Speed up grouping by bytes (#114021) #114652
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This speeds up grouping by bytes valued fields (keyword, text, ip, and
wildcard) when the input is an ordinal block:
```
bytes_refs 22.213 ± 0.322 -> 19.848 ± 0.205 ns/op (*maybe* real, maybe noise. still good)
ordinal didn't exist -> 2.988 ± 0.011 ns/op
```
I see this as 20ns -> 3ns, an 85% speed up. We never hard the ordinals
branch before so I'm expecting the same performance there - about 20ns
per op.
This also speeds up grouping by a pair of byte valued fields:
```
two_bytes_refs 83.112 ± 42.348 -> 46.521 ± 0.386 ns/op
two_ordinals 83.531 ± 23.473 -> 8.617 ± 0.105 ns/op
```
The speed up is much better when the fields are ordinals because hashing
bytes is comparatively slow.
I believe the ordinals case is quite common. I've run into it in quite a
few profiles.
nik9000
added
:Analytics/ES|QL
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Backports the following commits to 8.x: