Remove allocations from GetColumn & GetColumnIdx

table.go

@@ -47,19 +47,40 @@ func NewTable(name string, t reflect.Type) *Table {
 	}
 }
 
+func (table *Table) columnsByName(name string) []*Column {
+
+	n := len(name)
+
+	for k := range table.columnsMap {
+		if len(k) != n {
+			continue
+		}
+		if strings.EqualFold(k, name) {
+			return table.columnsMap[k]
+		}
+	}
+	return nil
+}
+
 func (table *Table) GetColumn(name string) *Column {
-	if c, ok := table.columnsMap[strings.ToLower(name)]; ok {
-		return c[0]
+
+	cols := table.columnsByName(name)
+
+	if cols != nil {
+		return cols[0]
 	}
+
 	return nil
 }
 
 func (table *Table) GetColumnIdx(name string, idx int) *Column {
-	if c, ok := table.columnsMap[strings.ToLower(name)]; ok {
-		if idx < len(c) {
-			return c[idx]
-		}
+
+	cols := table.columnsByName(name)
+
+	if cols != nil && idx < len(cols) {
+		return cols[idx]
 	}
+
 	return nil
 }