Implement tree explain for LocalLimitExec (#15232)

* feat: implement tree explain for locallimitexec

* remove hint

* Do not use VERBOSE

---------

Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>

Author: shruti2522

datafusion/physical-plan/src/limit.rs

@@ -268,8 +268,7 @@ impl DisplayAs for LocalLimitExec {
                 write!(f, "LocalLimitExec: fetch={}", self.fetch)
             }
             DisplayFormatType::TreeRender => {
-                // TODO: collect info
-                write!(f, "")
+                write!(f, "limit={}", self.fetch)
             }
         }
     }

datafusion/sqllogictest/test_files/explain_tree.slt

@@ -133,6 +133,11 @@ AS SELECT
 FROM
   hashjoin_datatype_table_t2_source
 
+statement ok
+CREATE TABLE limit_table AS
+SELECT * FROM table1
+UNION ALL SELECT * FROM table1
+
 ######## Begin Queries ########
 
 # Filter
@@ -246,6 +251,21 @@ physical_plan
 11)│        format: csv        │
 12)└───────────────────────────┘
 
+query TT
+explain SELECT * FROM limit_table LIMIT 10;
+----
+physical_plan
+01)┌───────────────────────────┐
+02)│   CoalescePartitionsExec  │
+03)└─────────────┬─────────────┘
+04)┌─────────────┴─────────────┐
+05)│       DataSourceExec      │
+06)│    --------------------   │
+07)│        bytes: 3120        │
+08)│       format: memory      │
+09)│          rows: 2          │
+10)└───────────────────────────┘
+
 # 2 Joins
 query TT
 explain SELECT table1.string_col, table2.date_col FROM table1 JOIN table2 ON table1.int_col = table2.int_col;