alamb commented on code in PR #11160:
URL: https://github.com/apache/datafusion/pull/11160#discussion_r1664110285
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datafusion-examples/examples/logical_type.rs:
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@@ -0,0 +1,108 @@
+use datafusion::datasource::TableProvider;
+use datafusion::execution::context::SessionState;
+use datafusion::physical_plan::ExecutionPlan;
+use datafusion_common::logical_type::schema::{LogicalSchema, LogicalSchemaRef};
+use datafusion::error::Result;
+use datafusion_expr::{Expr, TableType};
+use std::any::Any;
+use std::sync::Arc;
+use arrow::util::pretty::pretty_format_batches;
+use arrow_schema::{DataType, Field, TimeUnit};
+use datafusion::prelude::SessionContext;
+use datafusion_common::logical_type::{ExtensionType};
+use datafusion_common::logical_type::field::LogicalField;
+use datafusion_common::logical_type::signature::LogicalType;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+ let ctx = SessionContext::new();
+ ctx.register_table("example", Arc::new(ExampleTableSource::default()))?;
+
+ let df = ctx.sql("SELECT * FROM example").await?;
+ let records = df.collect().await?;
+
+ println!("{}", pretty_format_batches(&records)?);
Review Comment:
Is the primary usecase of the LogicalType so that we could write functions
that take the logical type, or define custom behavior?
Like I wonder is the idea that we could now create a `ScalarFunctionImpl`
whose signature refers to LogicalType rather than PhysicalType 🤔 Or somehow
plan a binary operation on logical types?
BTW I think the work we are doing with @samuelcolvin @dharanad and
@jayzhan211 in https://github.com/apache/datafusion/issues/11207 would make it
straightforward to implement a custom comparsion (via a function) for this
magical type
That might be a good thing to show too
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