[GitHub] [arrow-datafusion] Dandandan commented on a diff in pull request #3923: Support inlining view / dataframes logical plan

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

Dandandan commented on code in PR #3923:
URL: https://github.com/apache/arrow-datafusion/pull/3923#discussion_r1002070063


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datafusion/optimizer/src/inline_table_scan.rs:
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@@ -0,0 +1,188 @@
+// 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.
+
+//! Optimizer rule to replace TableScan references
+//! such as DataFrames and Views and inlines the LogicalPlan
+//! to support further optimization
+use crate::{OptimizerConfig, OptimizerRule};
+use datafusion_common::Result;
+use datafusion_expr::{
+    col, logical_plan::LogicalPlan, utils::from_plan, LogicalPlanBuilder, TableScan,
+};
+
+/// Optimization rule that inlines TableScan that provide a [LogicalPlan]
+/// ([DataFrame] / [ViewTable])
+#[derive(Default)]
+pub struct InlineTableScan;
+
+impl InlineTableScan {
+    #[allow(missing_docs)]
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+/// Inline
+fn inline_table_scan(plan: &LogicalPlan) -> Result<LogicalPlan> {
+    match plan {
+        LogicalPlan::TableScan(TableScan {
+            source,
+            table_name,
+            filters,
+            fetch,
+            projected_schema,
+            ..
+        }) => {
+            if let Some(sub_plan) = source.get_logical_plan() {
+                // Recurse into scan
+                let plan = inline_table_scan(sub_plan)?;
+                let mut plan = LogicalPlanBuilder::from(plan).project_with_alias(
+                    projected_schema
+                        .fields()
+                        .iter()
+                        .map(|field| col(field.name())),
+                    Some(table_name.clone()),
+                )?;
+                for filter in filters {

Review Comment:
   I think probably we can even remove handling filter / limit here as tables and for views/dataframes don't have those. Will remove the handling of possible.



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