alamb commented on a change in pull request #8090:
URL: https://github.com/apache/arrow/pull/8090#discussion_r481070644
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File path: rust/datafusion/tests/sql.rs
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@@ -682,6 +682,32 @@ fn query_length() -> Result<()> {
Ok(())
}
+#[test]
+fn query_concat() -> Result<()> {
+ let schema = Arc::new(Schema::new(vec![
+ Field::new("c1", DataType::Utf8, false),
+ Field::new("c2", DataType::Int32, true),
+ ]));
+
+ let data = RecordBatch::try_new(
+ schema.clone(),
+ vec![
+ Arc::new(StringArray::from(vec!["", "a", "aa", "aaa"])),
+ Arc::new(Int32Array::from(vec![Some(0), Some(1), None, Some(3)])),
+ ],
+ )?;
+
+ let table = MemTable::new(schema, vec![vec![data]])?;
+
+ let mut ctx = ExecutionContext::new();
+ ctx.register_table("test", Box::new(table));
+ let sql = "SELECT concat(c1, '-hi-', cast(c2 as varchar)) FROM test";
+ let actual = execute(&mut ctx, sql);
+ let expected = vec!["\"-hi-0\"", "\"a-hi-1\"", "\"\"", "\"aaa-hi-3\""];
Review comment:
I am surprised that the third result is `""` and not `NULL` (as the
third i32 input is NULL). Is that some artifact of using `execute`?
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