[-] fix for nil pointer exception when using .Kind() and closing the …

…rows (#197)

Co-authored-by: Sven Buijsrogge <[email protected]>

rows.go

@@ -80,7 +80,9 @@ func (rs *rowSets) FieldDescriptions() []pgconn.FieldDescription {
 // }
 
 func (rs *rowSets) Close() {
-	rs.ex.rowsWereClosed = true
+	if rs.ex != nil {
+		rs.ex.rowsWereClosed = true
+	}
 	// return rs.sets[rs.pos].closeErr
 }
 

rows_test.go

@@ -708,6 +708,10 @@ func TestRowsKind(t *testing.T) {
 			t.Fatalf("expected %s, but got %s", alphabet[i], letter)
 		}
 	}
+
+	// Test closing as this is called by the pgx library in pgx.CollectRows
+	// Previously this caused a nil pointer exception when Close was called on kindRows
+	kindRows.Close()
 }
 
 // TestConnRow tests the ConnRow interface implementation for Conn.QueryRow.