From b20054c1e505a8559da7579e540aa9dfa68b0daf Mon Sep 17 00:00:00 2001
From: k1LoW <k1lowxb@gmail.com>
Date: Fri, 3 May 2024 08:20:34 +0900
Subject: [PATCH] Support the case where name in index_info is NULL.

Fix https://github.com/k1LoW/tbls/issues/578
ref: https://www.sqlite.org/pragma.html#pragma_index_info

> 3. The name of the column being indexed. This columns is NULL if the column is the rowid or an expression.
---
 drivers/sqlite/sqlite.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/sqlite/sqlite.go b/drivers/sqlite/sqlite.go
index 9387afaa..a32b0e46 100644
--- a/drivers/sqlite/sqlite.go
+++ b/drivers/sqlite/sqlite.go
@@ -248,7 +248,7 @@ WHERE name != 'sqlite_sequence' AND (type = 'table' OR type = 'view');`)
 			var (
 				colRank            string
 				colRankWithinTable string
-				col                string
+				col                sql.NullString
 				cols               []string
 			)
 			row, err := l.db.Query(fmt.Sprintf("PRAGMA index_info(`%s`)", indexName))
@@ -264,7 +264,9 @@ WHERE name != 'sqlite_sequence' AND (type = 'table' OR type = 'view');`)
 				if err != nil {
 					return errors.WithStack(err)
 				}
-				cols = append(cols, col)
+				if col.Valid {
+					cols = append(cols, col.String)
+				}
 			}
 
 			switch indexCreatedBy {