From 15763f60cce326c7e42e3dd685c20a8dc46f4577 Mon Sep 17 00:00:00 2001
From: Hein <hein@bitechsystems.co.za>
Date: Thu, 30 Apr 2026 20:35:06 +0200
Subject: [PATCH] Fix GIN opclass handling for array columns

---
 pkg/writers/pgsql/writer.go      |  3 +++
 pkg/writers/pgsql/writer_test.go | 37 ++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/pkg/writers/pgsql/writer.go b/pkg/writers/pgsql/writer.go
index 9a1b241..613fa36 100644
--- a/pkg/writers/pgsql/writer.go
+++ b/pkg/writers/pgsql/writer.go
@@ -1251,6 +1251,9 @@ func isIntegerType(colType string) bool {
 func isTextType(colType string) bool {
 	textTypes := []string{"text", "varchar", "character varying", "char", "character", "string"}
 	lowerType := strings.ToLower(colType)
+	if strings.HasSuffix(lowerType, "[]") {
+		return false
+	}
 	for _, t := range textTypes {
 		if strings.HasPrefix(lowerType, t) {
 			return true
diff --git a/pkg/writers/pgsql/writer_test.go b/pkg/writers/pgsql/writer_test.go
index 776f6f1..356a6d2 100644
--- a/pkg/writers/pgsql/writer_test.go
+++ b/pkg/writers/pgsql/writer_test.go
@@ -87,6 +87,43 @@ func TestWriteDatabase(t *testing.T) {
 	}
 }
 
+func TestWriteDatabase_GinIndexOnTextArrayDoesNotUseTrigramOperatorClass(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("plans", "public")
+
+	tagsCol := models.InitColumn("tags", "plans", "public")
+	tagsCol.Type = "text[]"
+	table.Columns["tags"] = tagsCol
+
+	index := &models.Index{
+		Name:    "idx_plans_tags",
+		Type:    "gin",
+		Columns: []string{"tags"},
+	}
+	table.Indexes[index.Name] = index
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, `USING gin (tags)`) {
+		t.Fatalf("expected GIN index on array column without explicit trigram opclass, got:\n%s", output)
+	}
+	if strings.Contains(output, "gin_trgm_ops") {
+		t.Fatalf("did not expect gin_trgm_ops for text[] column, got:\n%s", output)
+	}
+}
+
 func TestWriteForeignKeys(t *testing.T) {
 	// Create a test database with two related tables
 	db := models.InitDatabase("testdb")