feat(tests): 🎉 More test for preload fixes.

* Implement tests for SanitizeWhereClause and AddTablePrefixToColumns.
* Ensure correct handling of table prefixes in WHERE clauses.
* Validate that unqualified columns are prefixed correctly when necessary.
* Add tests for XFiles processing to verify table name handling.
* Introduce tests for recursive preloads and their related keys.

pkg/common/sql_helpers_tablename_test.go

@@ -0,0 +1,103 @@
+package common
+
+import (
+	"testing"
+)
+
+// TestSanitizeWhereClause_WithTableName tests that table prefixes in WHERE clauses
+// are correctly handled when the tableName parameter matches the prefix
+func TestSanitizeWhereClause_WithTableName(t *testing.T) {
+	tests := []struct {
+		name      string
+		where     string
+		tableName string
+		options   *RequestOptions
+		expected  string
+	}{
+		{
+			name:      "Correct table prefix should not be changed",
+			where:     "mastertaskitem.rid_parentmastertaskitem is null",
+			tableName: "mastertaskitem",
+			options:   nil,
+			expected:  "mastertaskitem.rid_parentmastertaskitem is null",
+		},
+		{
+			name:      "Wrong table prefix should be fixed",
+			where:     "wrong_table.rid_parentmastertaskitem is null",
+			tableName: "mastertaskitem",
+			options:   nil,
+			expected:  "mastertaskitem.rid_parentmastertaskitem is null",
+		},
+		{
+			name:      "Relation name should not replace correct table prefix",
+			where:     "mastertaskitem.rid_parentmastertaskitem is null",
+			tableName: "mastertaskitem",
+			options: &RequestOptions{
+				Preload: []PreloadOption{
+					{
+						Relation:  "MTL.MAL.MAL_RID_PARENTMASTERTASKITEM",
+						TableName: "mastertaskitem",
+					},
+				},
+			},
+			expected: "mastertaskitem.rid_parentmastertaskitem is null",
+		},
+		{
+			name:      "Unqualified column should remain unqualified",
+			where:     "rid_parentmastertaskitem is null",
+			tableName: "mastertaskitem",
+			options:   nil,
+			expected:  "rid_parentmastertaskitem is null",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := SanitizeWhereClause(tt.where, tt.tableName, tt.options)
+			if result != tt.expected {
+				t.Errorf("SanitizeWhereClause(%q, %q) = %q, want %q",
+					tt.where, tt.tableName, result, tt.expected)
+			}
+		})
+	}
+}
+
+// TestAddTablePrefixToColumns_WithTableName tests that table prefixes
+// are correctly added to unqualified columns
+func TestAddTablePrefixToColumns_WithTableName(t *testing.T) {
+	tests := []struct {
+		name      string
+		where     string
+		tableName string
+		expected  string
+	}{
+		{
+			name:      "Add prefix to unqualified column",
+			where:     "rid_parentmastertaskitem is null",
+			tableName: "mastertaskitem",
+			expected:  "mastertaskitem.rid_parentmastertaskitem is null",
+		},
+		{
+			name:      "Don't change already qualified column",
+			where:     "mastertaskitem.rid_parentmastertaskitem is null",
+			tableName: "mastertaskitem",
+			expected:  "mastertaskitem.rid_parentmastertaskitem is null",
+		},
+		{
+			name:      "Don't change qualified column with different table",
+			where:     "other_table.rid_something is null",
+			tableName: "mastertaskitem",
+			expected:  "other_table.rid_something is null",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := AddTablePrefixToColumns(tt.where, tt.tableName)
+			if result != tt.expected {
+				t.Errorf("AddTablePrefixToColumns(%q, %q) = %q, want %q",
+					tt.where, tt.tableName, result, tt.expected)
+			}
+		})
+	}
+}