jecsand838 commented on code in PR #9162:
URL: https://github.com/apache/arrow-rs/pull/9162#discussion_r2696333971
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arrow-avro/src/schema.rs:
##########
@@ -3137,4 +3197,546 @@ mod tests {
assert_eq!(union_arr2[1], Value::String("int".into()));
assert_eq!(union_arr2[2], Value::String("string".into()));
}
+
+ #[test]
+ fn test_project_empty_projection() {
+ let schema_json = r#"{
+ "type": "record",
+ "name": "Test",
+ "fields": [
+ {"name": "a", "type": "int"},
+ {"name": "b", "type": "string"}
+ ]
+ }"#;
+ let schema = AvroSchema::new(schema_json.to_string());
+ let projected = schema.project(&[]).unwrap();
+ let v: Value = serde_json::from_str(&projected.json_string).unwrap();
+ let fields = v.get("fields").and_then(|f| f.as_array()).unwrap();
+ assert!(
+ fields.is_empty(),
+ "Empty projection should yield empty fields"
+ );
+ }
+
+ #[test]
+ fn test_project_single_field() {
+ let schema_json = r#"{
+ "type": "record",
+ "name": "Test",
+ "fields": [
+ {"name": "a", "type": "int"},
+ {"name": "b", "type": "string"},
+ {"name": "c", "type": "long"}
+ ]
+ }"#;
+ let schema = AvroSchema::new(schema_json.to_string());
+ let projected = schema.project(&[1]).unwrap();
+ let v: Value = serde_json::from_str(&projected.json_string).unwrap();
+ let fields = v.get("fields").and_then(|f| f.as_array()).unwrap();
+ assert_eq!(fields.len(), 1);
+ assert_eq!(fields[0].get("name").and_then(|n| n.as_str()), Some("b"));
+ }
+
+ #[test]
+ fn test_project_multiple_fields() {
+ let schema_json = r#"{
+ "type": "record",
+ "name": "Test",
+ "fields": [
+ {"name": "a", "type": "int"},
+ {"name": "b", "type": "string"},
+ {"name": "c", "type": "long"},
+ {"name": "d", "type": "boolean"}
+ ]
+ }"#;
+ let schema = AvroSchema::new(schema_json.to_string());
+ let projected = schema.project(&[0, 2, 3]).unwrap();
+ let v: Value = serde_json::from_str(&projected.json_string).unwrap();
+ let fields = v.get("fields").and_then(|f| f.as_array()).unwrap();
+ assert_eq!(fields.len(), 3);
+ assert_eq!(fields[0].get("name").and_then(|n| n.as_str()), Some("a"));
+ assert_eq!(fields[1].get("name").and_then(|n| n.as_str()), Some("c"));
+ assert_eq!(fields[2].get("name").and_then(|n| n.as_str()), Some("d"));
+ }
+
+ #[test]
+ fn test_project_all_fields() {
+ let schema_json = r#"{
+ "type": "record",
+ "name": "Test",
+ "fields": [
+ {"name": "a", "type": "int"},
+ {"name": "b", "type": "string"}
+ ]
+ }"#;
+ let schema = AvroSchema::new(schema_json.to_string());
+ let projected = schema.project(&[0, 1]).unwrap();
+ let v: Value = serde_json::from_str(&projected.json_string).unwrap();
+ let fields = v.get("fields").and_then(|f| f.as_array()).unwrap();
+ assert_eq!(fields.len(), 2);
+ assert_eq!(fields[0].get("name").and_then(|n| n.as_str()), Some("a"));
+ assert_eq!(fields[1].get("name").and_then(|n| n.as_str()), Some("b"));
+ }
+
+ #[test]
+ fn test_project_reorder_fields() {
+ let schema_json = r#"{
+ "type": "record",
+ "name": "Test",
+ "fields": [
+ {"name": "a", "type": "int"},
+ {"name": "b", "type": "string"},
+ {"name": "c", "type": "long"}
+ ]
+ }"#;
+ let schema = AvroSchema::new(schema_json.to_string());
+ // Project in reverse order
Review Comment:
Ah good catch, I'll clean the comment up.
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