mapleFU commented on issue #15165:
URL: https://github.com/apache/arrow/issues/15165#issuecomment-1369859665
Maybe the code is
```rust
fn try_new(descr: &ColumnDescPtr, props: &WriterProperties) ->
Result<Self> {
let dict_supported = props.dictionary_enabled(descr.path())
&& has_dictionary_support(T::get_physical_type(), props);
let dict_encoder = dict_supported.then(||
DictEncoder::new(descr.clone()));
// Set either main encoder or fallback encoder.
let encoder = get_encoder(
props
.encoding(descr.path())
.unwrap_or_else(|| fallback_encoding(T::get_physical_type(),
props)),
)?;
let statistics_enabled = props.statistics_enabled(descr.path());
let bloom_filter = props
.bloom_filter_properties(descr.path())
.map(|props| Sbbf::new_with_ndv_fpp(props.ndv, props.fpp))
.transpose()?;
Ok(Self {
encoder,
dict_encoder,
descr: descr.clone(),
num_values: 0,
statistics_enabled,
bloom_filter,
min_value: None,
max_value: None,
})
}
```
Seems that it creates a `encoder` when build the writer
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