add explain for sync agg index

tests/sqllogictests/suites/mode/standalone/ee/explain_agg_index.test

@@ -289,27 +289,76 @@ EvalScalar
                 ├── rewritten query: [selection: [index_col_0 (#0)]]
                 └── estimated rows: 0.00
 
+# for sync aggregating index
+
+statement ok
+SET enable_refresh_aggregating_index_after_write=1;
+
+statement ok
+DROP AGGREGATING INDEX idx1
+
+statement ok
+CREATE SYNC AGGREGATING INDEX idx1 AS SELECT a + 1 from t1
+
+statement ok
+INSERT INTO t1 VALUES (1,1), (1,2), (2,4), (2,5)
+
+query T
+EXPLAIN SELECT avg(a + 1) from t1
+----
+EvalScalar
+├── output columns: [(sum((a + 1)) / if((count((a + 1)) = 0), 1, count((a + 1)))) (#5)]
+├── expressions: [sum((a + 1)) (#3) / CAST(if(CAST(count((a + 1)) (#4) = 0 AS Boolean NULL), 1, count((a + 1)) (#4)) AS UInt64 NULL)]
+├── estimated rows: 1.00
+└── AggregateFinal
+    ├── output columns: [sum((a + 1)) (#3), count((a + 1)) (#4)]
+    ├── group by: []
+    ├── aggregate functions: [sum(sum_arg_0), count()]
+    ├── estimated rows: 1.00
+    └── AggregatePartial
+        ├── output columns: [sum((a + 1)) (#3), count((a + 1)) (#4)]
+        ├── group by: []
+        ├── aggregate functions: [sum(sum_arg_0), count()]
+        ├── estimated rows: 1.00
+        └── EvalScalar
+            ├── output columns: [sum_arg_0 (#2)]
+            ├── expressions: [t1.a (#0) + 1]
+            ├── estimated rows: 4.00
+            └── TableScan
+                ├── table: default.test_index_db.t1
+                ├── output columns: [a (#0)]
+                ├── read rows: 4
+                ├── read bytes: 47
+                ├── partitions total: 1
+                ├── partitions scanned: 1
+                ├── pruning stats: [segments: <range pruning: 1 to 1>, blocks: <range pruning: 1 to 1, bloom pruning: 0 to 0>]
+                ├── push downs: [filters: [], limit: NONE]
+                ├── aggregating index: [SELECT (a + 1) FROM test_index_db.t1]
+                ├── rewritten query: [selection: [index_col_0 (#0)]]
+                └── estimated rows: 4.00
+
 # Should not be rewritten
 query T
 EXPLAIN SELECT b, a + 1 as x from t1 order by x
 ----
 Sort
 ├── output columns: [t1.b (#1), x (#2)]
 ├── sort keys: [x ASC NULLS LAST]
-├── estimated rows: 0.00
+├── estimated rows: 4.00
 └── EvalScalar
     ├── output columns: [t1.b (#1), x (#2)]
     ├── expressions: [t1.a (#0) + 1]
-    ├── estimated rows: 0.00
+    ├── estimated rows: 4.00
     └── TableScan
         ├── table: default.test_index_db.t1
         ├── output columns: [a (#0), b (#1)]
-        ├── read rows: 0
-        ├── read bytes: 0
-        ├── partitions total: 0
-        ├── partitions scanned: 0
+        ├── read rows: 4
+        ├── read bytes: 94
+        ├── partitions total: 1
+        ├── partitions scanned: 1
+        ├── pruning stats: [segments: <range pruning: 1 to 1>, blocks: <range pruning: 1 to 1, bloom pruning: 0 to 0>]
         ├── push downs: [filters: [], limit: NONE]
-        └── estimated rows: 0.00
+        └── estimated rows: 4.00
 
 statement ok
 DROP AGGREGATING INDEX idx1