Force DateStyle and DateOrder in materialization

tsl/src/continuous_aggs/materialize.c

@@ -369,6 +369,25 @@ spi_update_watermark(Hypertable *mat_ht, SchemaAndName materialization_table,
 	}
 }
 
+static int SavedDateStyle;
+static int SavedDateOrder;
+
+static inline void
+set_date_config(int newDateStyle, int newDateOrder)
+{
+	SavedDateStyle = DateStyle;
+	SavedDateOrder = DateOrder;
+	DateStyle = newDateStyle;
+	DateOrder = newDateOrder;
+}
+
+static inline void
+unset_date_config()
+{
+	DateStyle = SavedDateStyle;
+	DateOrder = SavedDateOrder;
+}
+
 static void
 spi_update_materializations(Hypertable *mat_ht, const ContinuousAgg *cagg,
 							SchemaAndName partial_view, SchemaAndName materialization_table,
@@ -383,8 +402,10 @@ spi_update_materializations(Hypertable *mat_ht, const ContinuousAgg *cagg,
 	uint64 rows_processed = 0;
 
 	getTypeOutputInfo(invalidation_range.type, &out_fn, &type_is_varlena);
+	set_date_config(USE_ISO_DATES, DATEORDER_YMD);
 	invalidation_start = OidOutputFunctionCall(out_fn, invalidation_range.start);
 	invalidation_end = OidOutputFunctionCall(out_fn, invalidation_range.end);
+	unset_date_config();
 
 	/* MERGE statement is available starting on PG15 and we'll support it only in the new format of
 	 * CAggs and for non-compressed hypertables */