[GitHub] [arrow-datafusion] jgoday commented on a change in pull request #436: Remove reundant filters (e.g. c> 5 AND c>5 --> c>5)

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

jgoday commented on a change in pull request #436:
URL: https://github.com/apache/arrow-datafusion/pull/436#discussion_r643404061



##########
File path: datafusion/src/optimizer/remove_duplicate_filters.rs
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@@ -0,0 +1,611 @@
+// 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.
+
+//! Remove duplicate filters optimizer rule
+
+use crate::execution::context::ExecutionProps;
+use crate::logical_plan::LogicalPlan;
+use crate::logical_plan::{lit, Expr};
+use crate::optimizer::optimizer::OptimizerRule;
+use crate::optimizer::utils;
+use crate::optimizer::utils::optimize_explain;
+use crate::scalar::ScalarValue;
+use crate::{error::Result, logical_plan::Operator};
+
+/// Remove duplicate filters optimizer.
+/// # Introduction
+/// It uses boolean algebra laws to simplify or reduce the number of terms in expressions.
+///
+/// Filter: #b Gt Int32(2) And #b Gt Int32(2)
+/// is optimized to
+/// Filter: #b Gt Int32(2)
+pub struct RemoveDuplicateFilters {}
+
+fn expr_contains<'a>(expr: &'a Expr, needle: &'a Expr) -> bool {

Review comment:
       My mistake, should be fixed now.




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