tobyhede edited a comment on issue #1364:
URL:
https://github.com/apache/arrow-datafusion/issues/1364#issuecomment-980450411
Thanks @xudong963. The core docs are very good, but don't seem to include
any examples of using the scalar functions `lower, upper, starts_with, etc` .
I've been trying permutations with no luck.
eg My assumption (based on the equality operators) was that something like
this should work:
```
.filter(col("some_col").starts_with(lit("alpha")))
```
In the above, `starts_with` isn't found in the scope.
I can do this to get it compiling:
```
.filter(starts_with(lit("alpha")))
```
But this (obviously) fails at runtime. Message is:
```
Error: Plan("Coercion from [Utf8] to the signature OneOf([Exact([Utf8,
Utf8]), Exact([Utf8, LargeUtf8]), Exact([LargeUtf8, Utf8]), Exact([LargeUtf8,
LargeUtf8])]) failed.")
```
I know I am missing something a bit obvious :)
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