Bug fix to index relation creation bug (#1640)

Author: jakoguta

internal/endtoend/testdata/ddl_alter_table_index/postgresql/pgx/go/db.go

@@ -0,0 +1,2 @@
+-- name: Placeholder :exec
+SELECT 1;

internal/endtoend/testdata/ddl_alter_table_index/postgresql/pgx/go/models.go

@@ -0,0 +1,4 @@
+CREATE TABLE temp(a TEXT);
+
+CREATE INDEX temp_idx ON temp(a);
+ALTER INDEX temp_idx ATTACH PARTITION temp_partition_idx;

internal/endtoend/testdata/ddl_alter_table_index/postgresql/pgx/go/query.sql.go

@@ -0,0 +1,13 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "postgresql",
+      "sql_package": "pgx/v4",
+      "name": "querytest",
+      "schema": "schema.sql",
+      "queries": "query.sql"
+    }
+  ]
+}

internal/endtoend/testdata/ddl_alter_table_index/postgresql/pgx/query.sql

@@ -0,0 +1,2 @@
+-- name: Placeholder :exec
+SELECT 1;