[GitHub] [arrow-datafusion] liukun4515 commented on a diff in pull request #2200: add sql level test for decimal data type

[GitBox <gi...@apache.org>]

liukun4515 commented on code in PR #2200:
URL: https://github.com/apache/arrow-datafusion/pull/2200#discussion_r850018300


##########
datafusion/core/tests/sql/decimal.rs:
##########
@@ -0,0 +1,428 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use super::*;
+
+#[tokio::test]
+async fn decimal_cast() -> Result<()> {
+    let ctx = SessionContext::new();
+    let sql = "select cast(1.23 as decimal(10,4))";
+    let actual = execute_to_batches(&ctx, sql).await;
+    assert_eq!(
+        &DataType::Decimal(10, 4),
+        actual[0].schema().field(0).data_type()
+    );
+    let expected = vec![
+        "+---------------------------------------+",
+        "| CAST(Float64(1.23) AS Decimal(10, 4)) |",
+        "+---------------------------------------+",
+        "| 1.2300                                |",
+        "+---------------------------------------+",
+    ];
+    assert_batches_eq!(expected, &actual);
+
+    let sql = "select cast(cast(1.23 as decimal(10,3)) as decimal(10,4))";
+    let actual = execute_to_batches(&ctx, sql).await;
+    assert_eq!(
+        &DataType::Decimal(10, 4),
+        actual[0].schema().field(0).data_type()
+    );
+    let expected = vec![
+        "+---------------------------------------------------------------+",
+        "| CAST(CAST(Float64(1.23) AS Decimal(10, 3)) AS Decimal(10, 4)) |",
+        "+---------------------------------------------------------------+",
+        "| 1.2300                                                        |",
+        "+---------------------------------------------------------------+",
+    ];
+    assert_batches_eq!(expected, &actual);
+
+    let sql = "select cast(1.2345 as decimal(24,2))";
+    let actual = execute_to_batches(&ctx, sql).await;
+    assert_eq!(
+        &DataType::Decimal(24, 2),
+        actual[0].schema().field(0).data_type()
+    );
+    let expected = vec![
+        "+-----------------------------------------+",
+        "| CAST(Float64(1.2345) AS Decimal(24, 2)) |",
+        "+-----------------------------------------+",
+        "| 1.23                                    |",
+        "+-----------------------------------------+",
+    ];
+    assert_batches_eq!(expected, &actual);
+
+    Ok(())
+}
+
+#[tokio::test]
+async fn decimal_by_sql() -> Result<()> {
+    let ctx = SessionContext::new();
+    register_decimal_csv_table_by_sql(&ctx).await;
+    let sql = "SELECT c1 from decimal_simple";
+    let actual = execute_to_batches(&ctx, sql).await;
+    let expected = vec![
+        "+----------+",
+        "| c1       |",
+        "+----------+",
+        "| 0.000010 |",
+        "| 0.000020 |",
+        "| 0.000020 |",
+        "| 0.000030 |",
+        "| 0.000030 |",
+        "| 0.000030 |",
+        "| 0.000040 |",
+        "| 0.000040 |",
+        "| 0.000040 |",
+        "| 0.000040 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "+----------+",
+    ];
+    assert_batches_eq!(expected, &actual);
+    Ok(())
+}
+
+#[tokio::test]
+async fn decimal_by_filter() -> Result<()> {
+    let ctx = SessionContext::new();
+    register_decimal_csv_table_by_sql(&ctx).await;
+    let sql = "select c1 from decimal_simple where c1 > 0.000030";
+    let actual = execute_to_batches(&ctx, sql).await;
+    let expected = vec![
+        "+----------+",
+        "| c1       |",
+        "+----------+",
+        "| 0.000040 |",
+        "| 0.000040 |",
+        "| 0.000040 |",
+        "| 0.000040 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "| 0.000050 |",
+        "+----------+",
+    ];
+    assert_batches_eq!(expected, &actual);
+
+    let sql = "select * from decimal_simple where c1 > c5";
+    let actual = execute_to_batches(&ctx, sql).await;
+    let expected = vec![
+        "+----------+----------------+----+-------+-----------+",
+        "| c1       | c2             | c3 | c4    | c5        |",
+        "+----------+----------------+----+-------+-----------+",
+        "| 0.000020 | 0.000000000002 | 3  | false | 0.0000190 |",
+        "| 0.000030 | 0.000000000003 | 5  | true  | 0.0000110 |",
+        "| 0.000050 | 0.000000000005 | 8  | false | 0.0000330 |",
+        "+----------+----------------+----+-------+-----------+",
+    ];
+    assert_batches_eq!(expected, &actual);
+    Ok(())
+}
+
+#[tokio::test]
+async fn decimal_agg_function() -> Result<()> {
+    let ctx = SessionContext::new();
+    register_decimal_csv_table_by_sql(&ctx).await;
+    // min
+    let sql = "select min(c1) from decimal_simple where c4=false";
+    let actual = execute_to_batches(&ctx, sql).await;

Review Comment:
   I just want to cover the agg functions which support the decimal data type.



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