From 6e430b38987a6ad86818df3da5823bba17f3d6de Mon Sep 17 00:00:00 2001
From: evenyag <realevenyag@gmail.com>
Date: Wed, 29 Oct 2025 12:03:27 +0800
Subject: [PATCH] test: test mito filter delete

Signed-off-by: evenyag <realevenyag@gmail.com>
---
 src/mito2/src/engine/prune_test.rs | 100 ++++++++++++++++++++++++++++-
 src/mito2/src/test_util.rs         |  13 ++++
 2 files changed, 112 insertions(+), 1 deletion(-)

diff --git a/src/mito2/src/engine/prune_test.rs b/src/mito2/src/engine/prune_test.rs
index b260024043..beb5e2644a 100644
--- a/src/mito2/src/engine/prune_test.rs
+++ b/src/mito2/src/engine/prune_test.rs
@@ -22,8 +22,10 @@ use store_api::region_request::RegionRequest;
 use store_api::storage::{RegionId, ScanRequest};
 
 use crate::config::MitoConfig;
+use crate::test_util::batch_util::sort_batches_and_print;
 use crate::test_util::{
-    CreateRequestBuilder, TestEnv, build_rows, flush_region, put_rows, rows_schema,
+    CreateRequestBuilder, TestEnv, build_delete_rows, build_rows, delete_rows, delete_rows_schema,
+    flush_region, put_rows, rows_schema,
 };
 
 async fn check_prune_row_groups(exprs: Vec<Expr>, expected: &str, flat_format: bool) {
@@ -377,3 +379,99 @@ async fn test_mem_range_prune_with_format(flat_format: bool) {
 +-------+---------+---------------------+";
     assert_eq!(expected, batches.pretty_print().unwrap());
 }
+
+#[tokio::test]
+async fn test_scan_filter_field_after_delete() {
+    test_scan_filter_field_after_delete_with_format(false).await;
+    test_scan_filter_field_after_delete_with_format(true).await;
+}
+
+async fn test_scan_filter_field_after_delete_with_format(flat_format: bool) {
+    common_telemetry::init_default_ut_logging();
+
+    let mut env = TestEnv::new().await;
+    let engine = env
+        .create_engine(MitoConfig {
+            default_experimental_flat_format: flat_format,
+            ..Default::default()
+        })
+        .await;
+
+    let region_id = RegionId::new(1, 1);
+
+    env.get_schema_metadata_manager()
+        .register_region_table_info(
+            region_id.table_id(),
+            "test_table",
+            "test_catalog",
+            "test_schema",
+            None,
+            env.get_kv_backend(),
+        )
+        .await;
+    let request = CreateRequestBuilder::new()
+        .insert_option("compaction.type", "twcs")
+        .build();
+
+    let column_schemas = rows_schema(&request);
+    engine
+        .handle_request(region_id, RegionRequest::Create(request.clone()))
+        .await
+        .unwrap();
+
+    // put 1, 2, 3, 4 and flush
+    put_rows(
+        &engine,
+        region_id,
+        Rows {
+            schema: column_schemas,
+            rows: build_rows(1, 5),
+        },
+    )
+    .await;
+    flush_region(&engine, region_id, None).await;
+
+    // delete 2, 3
+    let delete_schemas = delete_rows_schema(&request);
+    delete_rows(
+        &engine,
+        region_id,
+        Rows {
+            schema: delete_schemas,
+            rows: build_delete_rows(2, 4),
+        },
+    )
+    .await;
+
+    // Scans and filter fields, the field should be deleted.
+    let request = ScanRequest {
+        filters: vec![col("field_0").eq(lit(3.0f64))],
+        ..Default::default()
+    };
+    let stream = engine
+        .scan_to_stream(region_id, request.clone())
+        .await
+        .unwrap();
+    let batches = RecordBatches::try_collect(stream).await.unwrap();
+    let expected = "\
++-------+---------+----+
+| tag_0 | field_0 | ts |
++-------+---------+----+
++-------+---------+----+";
+    assert_eq!(
+        expected,
+        sort_batches_and_print(&batches, &["tag_0", "field_0", "ts"])
+    );
+
+    // flush delete op
+    flush_region(&engine, region_id, None).await;
+    let stream = engine
+        .scan_to_stream(region_id, request.clone())
+        .await
+        .unwrap();
+    let batches = RecordBatches::try_collect(stream).await.unwrap();
+    assert_eq!(
+        expected,
+        sort_batches_and_print(&batches, &["tag_0", "field_0", "ts"])
+    );
+}
diff --git a/src/mito2/src/test_util.rs b/src/mito2/src/test_util.rs
index 4aac6f2e4b..0f3acc93b9 100644
--- a/src/mito2/src/test_util.rs
+++ b/src/mito2/src/test_util.rs
@@ -1068,6 +1068,19 @@ pub fn build_rows(start: usize, end: usize) -> Vec<Row> {
         .collect()
 }
 
+/// Build rows with schema (string, ts_millis) in range `[start, end)`.
+/// `start`, `end` are in second resolution.
+pub fn build_delete_rows(start: usize, end: usize) -> Vec<Row> {
+    (start..end)
+        .map(|i| {
+            row(vec![
+                ValueData::StringValue(i.to_string()),
+                ValueData::TimestampMillisecondValue(i as i64 * 1000),
+            ])
+        })
+        .collect()
+}
+
 /// Build rows with schema (string, f64, f64, ts_millis).
 /// - `key`: A string key that is common across all rows.
 /// - `timestamps`: Array of timestamp values.