Re: [PR] Examples: boundary analysis example for `AND/OR` conjunctions [datafusion]

["clflushopt (via GitHub)" <gi...@apache.org>]

clflushopt commented on code in PR #14735:
URL: https://github.com/apache/datafusion/pull/14735#discussion_r1976136920


##########
docs/source/library-user-guide/query-optimizer.md:
##########
@@ -388,3 +388,119 @@ In the following example, the `type_coercion` and `simplify_expressions` passes
 ```
 
 [df]: https://crates.io/crates/datafusion
+
+## Thinking about Query Optimization
+
+Query optimization in DataFusion uses a cost based model. The cost based model
+relies on table and column level statistics to estimate selectivity; selectivity
+estimates are an important piece in cost analysis for filters and projections
+as they allow estimating the cost of joins and filters.
+
+An important piece of building these estimates is _boundary analysis_ which uses
+interval arithmetic to take an expression such as `a > 2500 AND a <= 5000` and
+build an accurate selectivity estimate that can then be used to find more efficient
+plans.
+
+#### `AnalysisContext` API
+
+The `AnalysisContext` serves as a shared knowledge base during expression evaluation

Review Comment:
   👍 will do !



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