From dda13b3c9778b65717abb6f9a58af8dea40c8f00 Mon Sep 17 00:00:00 2001
From: Erica Fischer <enf@felt.com>
Date: Fri, 3 Jan 2025 10:26:54 -0800
Subject: [PATCH] Case smashing and prefix trimming in the select

---
 tile-join.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tile-join.cpp b/tile-join.cpp
index 8304ec0f..a9b2eea7 100644
--- a/tile-join.cpp
+++ b/tile-join.cpp
@@ -83,8 +83,10 @@ std::vector<std::map<std::string, mvt_value>> get_joined_rows(sqlite3 *db, const
 	ret.resize(join_keys.size());
 
 	// double quotes for table and column identifiers
-	const char *s = sqlite3_mprintf("select \"%w\", * from \"%w\" where \"%w\" in (",
-					join_table_column.c_str(), join_table.c_str(), join_table_column.c_str());
+	const char *s = sqlite3_mprintf("select LOWER(LTRIM(SUBSTR(\"%w\",1,LENGTH(\"%w\")-3),'0')||SUBSTR(\"%w\",-3,3)), * from \"%w\" where LOWER(LTRIM(SUBSTR(\"%w\",1,LENGTH(\"%w\")-3),'0')||SUBSTR(\"%w\",-3,3)) in (",
+					join_table_column.c_str(), join_table_column.c_str(), join_table_column.c_str(),
+					join_table.c_str(),
+					join_table_column.c_str(), join_table_column.c_str(), join_table_column.c_str());
 	std::string query = s;
 	sqlite3_free((void *) s);