fix more typo

Author: adriangb

datafusion/expr/src/expr.rs

@@ -1936,7 +1936,7 @@ impl Expr {
     /// Returns the placement classification of this expression.
     ///
     /// This tells us if optimizers should preferentially
-    /// move this expression towards the leafs of the execution plan
+    /// move this expression towards the leaves of the execution plan
     /// tree (for cheap expressions or expressions that reduce the data size)
     /// or towards the root of the execution plan tree (for expensive expressions
     /// that should be run after filtering or parallelization, or expressions that increase the data size).

datafusion/expr/src/udf.rs

@@ -918,15 +918,15 @@ pub trait ScalarUDFImpl: Debug + DynEq + DynHash + Send + Sync {
     /// # Example
     ///
     /// - `get_field(struct_col, 'field_name')` with a literal key is leaf-pushable as it
-    ///    performs metadata only (cheap) extraction of a sub-array from a struct column.
-    ///    Thus, it can be placed near the data source to minimize data early.
+    ///   performs metadata only (cheap) extraction of a sub-array from a struct column.
+    ///   Thus, it can be placed near the data source to minimize data early.
     /// - `string_col like '%foo%'` performs expensive per-row computation and should be placed
-    ///    further up the tree so that it can be run after filtering, sorting, etc.
+    ///   further up the tree so that it can be run after filtering, sorting, etc.
     ///
     /// # Arguments
     ///
     /// * `args` - Classification of each argument's placement, collected from the expression tree
-    ///    by the caller.
+    ///   by the caller.
     fn placement(&self, _args: &[ExpressionPlacement]) -> ExpressionPlacement {
         ExpressionPlacement::PlaceAtRoot
     }

datafusion/physical-plan/src/filter.rs

@@ -568,7 +568,7 @@ impl ExecutionPlan for FilterExec {
         projection: &ProjectionExec,
     ) -> Result<Option<Arc<dyn ExecutionPlan>>> {
         // If we have an embedded projection already we cannot continue
-        // This is not a real problem: calling this method generates the embeded projection
+        // This is not a real problem: calling this method generates the embedded projection
         // so we should not have one already!
         if self.projection().is_some() {
             return Ok(None);