nlimpid commented on code in PR #19370:
URL: https://github.com/apache/datafusion/pull/19370#discussion_r2658691025
##########
datafusion/core/src/datasource/file_format/json.rs:
##########
@@ -349,4 +349,42 @@ mod tests {
fn fmt_batches(batches: &[RecordBatch]) -> String {
pretty::pretty_format_batches(batches).unwrap().to_string()
}
+
+ #[tokio::test]
+ async fn test_write_empty_json_from_sql() -> Result<()> {
+ let ctx = SessionContext::new();
+ let tmp_dir = tempfile::TempDir::new()?;
+ let path = format!("{}/empty_sql.json",
tmp_dir.path().to_string_lossy());
+ let df = ctx.sql("SELECT CAST(1 AS BIGINT) AS id LIMIT 0").await?;
+ df.write_json(&path, crate::dataframe::DataFrameWriteOptions::new(),
None)
+ .await?;
+ // Expected the file to exist
+ assert!(std::path::Path::new(&path).exists());
+ Ok(())
+ }
+
+ #[tokio::test]
+ async fn test_write_empty_json_from_record_batch() -> Result<()> {
+ let ctx = SessionContext::new();
+ let schema = Arc::new(Schema::new(vec![
+ Field::new("id", DataType::Int64, false),
+ Field::new("name", DataType::Utf8, true),
+ ]));
+ let empty_batch = RecordBatch::try_new(
+ schema.clone(),
+ vec![
+ Arc::new(arrow::array::Int64Array::from(Vec::<i64>::new())),
+
Arc::new(arrow::array::StringArray::from(Vec::<Option<&str>>::new())),
+ ],
+ )?;
+
+ let tmp_dir = tempfile::TempDir::new()?;
+ let path = format!("{}/empty_batch.json",
tmp_dir.path().to_string_lossy());
+ let df = ctx.read_batch(empty_batch.clone())?;
+ df.write_json(&path, crate::dataframe::DataFrameWriteOptions::new(),
None)
+ .await?;
+ // Expected the file to exist
+ assert!(std::path::Path::new(&path).exists());
Review Comment:
For JSON, empty files can't be read back to validate schema, Add file check
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