From 898433fcc2927d218da4b1405d3d2d3554c67617 Mon Sep 17 00:00:00 2001
From: joshuao11 <joshua.oakley@guardian.co.uk>
Date: Fri, 8 Nov 2024 14:57:58 +0000
Subject: [PATCH 1/2] Drop temp table if exists

The insert overwrite does this, so let's copy that pattern here to keep the schemas/datasets tidy in BQ for the users
---
 .../materializations/incremental_strategy/merge.sql       | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dbt/include/bigquery/macros/materializations/incremental_strategy/merge.sql b/dbt/include/bigquery/macros/materializations/incremental_strategy/merge.sql
index a204caed9..091f7cd91 100644
--- a/dbt/include/bigquery/macros/materializations/incremental_strategy/merge.sql
+++ b/dbt/include/bigquery/macros/materializations/incremental_strategy/merge.sql
@@ -27,8 +27,12 @@
         {% do predicates.append(avoid_require_partition_filter) %}
     {%- endif -%}
 
-    {% set build_sql = get_merge_sql(target_relation, source_sql, unique_key, dest_columns, predicates) %}
+    -- 1. Run merge statement
+    {{ get_merge_sql(target_relation, source_sql, unique_key, dest_columns, predicates) }};
 
-    {{ return(build_sql) }}
+    {% if tmp_relation_exists -%}
+    -- 2. clean up the temp table if we have used one
+      drop table if exists {{ tmp_relation }};
+    {%- endif -%}
 
 {% endmacro %}

From 647544d2c4b35922bcbf46f7b65be1e069811014 Mon Sep 17 00:00:00 2001
From: joshuao11 <joshua.oakley@guardian.co.uk>
Date: Fri, 8 Nov 2024 15:46:38 +0000
Subject: [PATCH 2/2] Generated by Changie

---
 .changes/unreleased/Fixes-20241108-154557.yaml | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 .changes/unreleased/Fixes-20241108-154557.yaml

diff --git a/.changes/unreleased/Fixes-20241108-154557.yaml b/.changes/unreleased/Fixes-20241108-154557.yaml
new file mode 100644
index 000000000..0bc3c9622
--- /dev/null
+++ b/.changes/unreleased/Fixes-20241108-154557.yaml
@@ -0,0 +1,6 @@
+kind: Fixes
+body: Cleans up the temp table created by the merge incremental stratergy when checking the schema
+time: 2024-11-08T15:45:57.570611Z
+custom:
+    Author: joshuao11
+    Issue: "1389"