tobixdev commented on code in PR #18552:
URL: https://github.com/apache/datafusion/pull/18552#discussion_r2671521215
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datafusion/core/src/dataframe/array_formatter_factory.rs:
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@@ -0,0 +1,51 @@
+use arrow::array::Array;
+use arrow::util::display::{ArrayFormatter, ArrayFormatterFactory,
FormatOptions};
+use arrow_schema::{ArrowError, Field};
+use datafusion_expr::registry::ExtensionTypeRegistry;
+use std::sync::Arc;
+
+/// A factory for creating [`ArrayFormatter`]s that checks whether a
registered extension type can
+/// format a given array based on its metadata.
+#[derive(Debug)]
+pub struct DFArrayFormatterFactory {
Review Comment:
DataFusion's implementation for record batch pretty-prining.
Basically:
1. Check if extension type is present
2. If yes, check if it is registered
3. If yes, check if there is a custom pretty printer
4. If yes, use that pretty pringer
Otherwise use the default formatter
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