diff --git a/src/query/src/optimizer/count_wildcard.rs b/src/query/src/optimizer/count_wildcard.rs
index 359d333c25..b8a491003b 100644
--- a/src/query/src/optimizer/count_wildcard.rs
+++ b/src/query/src/optimizer/count_wildcard.rs
@@ -16,12 +16,13 @@ use datafusion::datasource::DefaultTableSource;
 use datafusion_common::tree_node::{
     Transformed, TransformedResult, TreeNode, TreeNodeRecursion, TreeNodeVisitor,
 };
-use datafusion_common::Result as DataFusionResult;
+use datafusion_common::{Column, Result as DataFusionResult};
 use datafusion_expr::expr::{AggregateFunction, AggregateFunctionDefinition, WindowFunction};
 use datafusion_expr::utils::COUNT_STAR_EXPANSION;
 use datafusion_expr::{col, lit, Expr, LogicalPlan, WindowFunctionDefinition};
 use datafusion_optimizer::utils::NamePreserver;
 use datafusion_optimizer::AnalyzerRule;
+use datafusion_sql::TableReference;
 use table::table::adapter::DfTableProviderAdapter;
 
 /// A replacement to DataFusion's [`CountWildcardRule`]. This rule
@@ -77,11 +78,27 @@ impl CountWildcardToTimeIndexRule {
         })
     }
 
-    fn try_find_time_index_col(plan: &LogicalPlan) -> Option<String> {
+    fn try_find_time_index_col(plan: &LogicalPlan) -> Option<Column> {
         let mut finder = TimeIndexFinder::default();
         // Safety: `TimeIndexFinder` won't throw error.
         plan.visit(&mut finder).unwrap();
-        finder.time_index
+        let col = finder.into_column();
+
+        // check if the time index is a valid column as for current plan
+        if let Some(col) = &col {
+            let mut is_valid = false;
+            for input in plan.inputs() {
+                if input.schema().has_column(col) {
+                    is_valid = true;
+                    break;
+                }
+            }
+            if !is_valid {
+                return None;
+            }
+        }
+
+        col
     }
 }
 
@@ -114,8 +131,8 @@ impl CountWildcardToTimeIndexRule {
 
 #[derive(Default)]
 struct TimeIndexFinder {
-    time_index: Option<String>,
-    table_alias: Option<String>,
+    time_index_col: Option<String>,
+    table_alias: Option<TableReference>,
 }
 
 impl TreeNodeVisitor for TimeIndexFinder {
@@ -123,7 +140,7 @@ impl TreeNodeVisitor for TimeIndexFinder {
 
     fn f_down(&mut self, node: &Self::Node) -> DataFusionResult<TreeNodeRecursion> {
         if let LogicalPlan::SubqueryAlias(subquery_alias) = node {
-            self.table_alias = Some(subquery_alias.alias.to_string());
+            self.table_alias = Some(subquery_alias.alias.clone());
         }
 
         if let LogicalPlan::TableScan(table_scan) = &node {
@@ -138,9 +155,13 @@ impl TreeNodeVisitor for TimeIndexFinder {
                     .downcast_ref::<DfTableProviderAdapter>()
                 {
                     let table_info = adapter.table().table_info();
-                    let col_name = table_info.meta.schema.timestamp_column().map(|c| &c.name);
-                    let table_name = self.table_alias.as_ref().unwrap_or(&table_info.name);
-                    self.time_index = col_name.map(|s| format!("{}.{}", table_name, s));
+                    self.table_alias
+                        .get_or_insert(TableReference::bare(table_info.name.clone()));
+                    self.time_index_col = table_info
+                        .meta
+                        .schema
+                        .timestamp_column()
+                        .map(|c| c.name.clone());
 
                     return Ok(TreeNodeRecursion::Stop);
                 }
@@ -154,3 +175,43 @@ impl TreeNodeVisitor for TimeIndexFinder {
         Ok(TreeNodeRecursion::Stop)
     }
 }
+
+impl TimeIndexFinder {
+    fn into_column(self) -> Option<Column> {
+        self.time_index_col
+            .map(|c| Column::new(self.table_alias, c))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use std::sync::Arc;
+
+    use datafusion_expr::{count, wildcard, LogicalPlanBuilder};
+    use table::table::numbers::NumbersTable;
+
+    use super::*;
+
+    #[test]
+    fn uppercase_table_name() {
+        let numbers_table = NumbersTable::table_with_name(0, "AbCdE".to_string());
+        let table_source = Arc::new(DefaultTableSource::new(Arc::new(
+            DfTableProviderAdapter::new(numbers_table),
+        )));
+
+        let plan = LogicalPlanBuilder::scan_with_filters("t", table_source, None, vec![])
+            .unwrap()
+            .aggregate(Vec::<Expr>::new(), vec![count(wildcard())])
+            .unwrap()
+            .alias(r#""FgHiJ""#)
+            .unwrap()
+            .build()
+            .unwrap();
+
+        let mut finder = TimeIndexFinder::default();
+        plan.visit(&mut finder).unwrap();
+
+        assert_eq!(finder.table_alias, Some(TableReference::bare("FgHiJ")));
+        assert!(finder.time_index_col.is_none());
+    }
+}
diff --git a/tests/cases/standalone/common/aggregate/count.result b/tests/cases/standalone/common/aggregate/count.result
new file mode 100644
index 0000000000..4523118d18
--- /dev/null
+++ b/tests/cases/standalone/common/aggregate/count.result
@@ -0,0 +1,56 @@
+create table "HelloWorld" (a string, b timestamp time index);
+
+Affected Rows: 0
+
+insert into "HelloWorld" values ("a", 1) ,("b", 2);
+
+Affected Rows: 2
+
+select count(*) from "HelloWorld";
+
++----------+
+| COUNT(*) |
++----------+
+| 2        |
++----------+
+
+create table test (a string, "BbB" timestamp time index);
+
+Affected Rows: 0
+
+insert into test values ("c", 1) ;
+
+Affected Rows: 1
+
+select count(*) from test;
+
++----------+
+| COUNT(*) |
++----------+
+| 1        |
++----------+
+
+select count(*) from (select count(*) from test where a = 'a');
+
++----------+
+| COUNT(*) |
++----------+
+| 1        |
++----------+
+
+select count(*) from (select * from test cross join "HelloWorld");
+
++----------+
+| COUNT(*) |
++----------+
+| 2        |
++----------+
+
+drop table "HelloWorld";
+
+Affected Rows: 0
+
+drop table test;
+
+Affected Rows: 0
+
diff --git a/tests/cases/standalone/common/aggregate/count.sql b/tests/cases/standalone/common/aggregate/count.sql
new file mode 100644
index 0000000000..80100c96ae
--- /dev/null
+++ b/tests/cases/standalone/common/aggregate/count.sql
@@ -0,0 +1,19 @@
+create table "HelloWorld" (a string, b timestamp time index);
+
+insert into "HelloWorld" values ("a", 1) ,("b", 2);
+
+select count(*) from "HelloWorld";
+
+create table test (a string, "BbB" timestamp time index);
+
+insert into test values ("c", 1) ;
+
+select count(*) from test;
+
+select count(*) from (select count(*) from test where a = 'a');
+
+select count(*) from (select * from test cross join "HelloWorld");
+
+drop table "HelloWorld";
+
+drop table test;