[GitHub] [arrow-datafusion] Jimexist commented on a change in pull request #492: Add window frame constructs

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

Jimexist commented on a change in pull request #492:
URL: https://github.com/apache/arrow-datafusion/pull/492#discussion_r645944801



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File path: datafusion/src/physical_plan/window_frames.rs
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@@ -0,0 +1,200 @@
+// 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.
+
+//! Window frame
+//!
+//! The frame-spec determines which output rows are read by an aggregate window function. The frame-spec consists of four parts:
+//! - A frame type - either ROWS, RANGE or GROUPS,
+//! - A starting frame boundary,
+//! - An ending frame boundary,
+//! - An EXCLUDE clause.
+
+use crate::error::{DataFusionError, Result};
+use sqlparser::ast::{WindowFrame, WindowFrameBound, WindowFrameUnits};

Review comment:
       i see your point, let's review https://github.com/apache/arrow-datafusion/pull/506 as an alternative




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