test: Add test case for #1646

Author: kyleconroy

internal/endtoend/testdata/insert_select_case/issue.md

@@ -0,0 +1 @@
+https://github.com/sqlc-dev/sqlc/issues/1646

internal/endtoend/testdata/insert_select_case/postgresql/pgx/exec.json

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+{
+  "contexts": ["managed-db"]
+}

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

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+-- name: InsertOrders :exec
+insert into Orders (id,name)
+select id , CASE WHEN @name_do_update::BOOLEAN THEN @name ELSE s.name END 
+from Orders s ;

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

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+CREATE TABLE orders(
+  id bigserial,
+  name text
+);

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

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+version: "2"
+cloud:
+  project: "01HAQMMECEYQYKFJN8MP16QC41"
+sql:
+  - engine: "postgresql"
+    schema: "schema.sql"
+    queries: "query.sql"
+    gen:
+      go:
+        package: "querytest"
+        out: "go"
+        sql_package: "pgx/v5"