Implement support for interval units.

[#566][resolves #565]

Co-authored-by: Emil Wihlander <emil.wihlander@zynka.se>

Author: emilwihlander

src/main/java/io/r2dbc/postgresql/codec/Interval.java

@@ -828,16 +828,24 @@ private static Interval parsePostgresIntervalValue(String value) {
 
                 token = st.nextToken();
 
-                // This handles years, months, days for both, ISO and
+                // This handles millenniums, centuries, decades, years, months, weeks, days for both, ISO and
                 // Non-ISO intervals. Hours, minutes, seconds and microseconds
                 // are handled for Non-ISO intervals here.
 
-                if (token.startsWith("year") || token.startsWith("yr")) {
-                    years = Integer.parseInt(valueToken);
+                if (token.startsWith("mill")) {
+                    years = Math.addExact(years, Math.toIntExact(Math.multiplyExact(Integer.parseInt(valueToken), 1000)));
+                } else if (token.startsWith("cent") || token.equals("c")) {
+                    years = Math.addExact(years, Math.toIntExact(Math.multiplyExact(Integer.parseInt(valueToken), 100)));
+                } else if (token.startsWith("dec")) {
+                    years = Math.addExact(years, Math.toIntExact(Math.multiplyExact(Integer.parseInt(valueToken), 10)));
+                } else if (token.startsWith("year") || token.startsWith("yr")) {
+                    years = Math.addExact(years, Math.toIntExact(Integer.parseInt(valueToken)));
                 } else if (token.startsWith("mon")) {
                     months = Integer.parseInt(valueToken);
+                } else if (token.startsWith("week") || token.equals("w")) {
+                    days = Math.addExact(days, Math.toIntExact(Math.multiplyExact(Integer.parseInt(valueToken), 7)));
                 } else if (token.startsWith("day")) {
-                    days = Integer.parseInt(valueToken);
+                    days = Math.addExact(days, Math.toIntExact(Integer.parseInt(valueToken)));
                 } else if (token.startsWith("hour") || token.startsWith("hr")) {
                     hours = Integer.parseInt(valueToken);
                 } else if (token.startsWith("min")) {

src/test/java/io/r2dbc/postgresql/codec/IntervalUnitTests.java

@@ -63,6 +63,12 @@ static Stream<Object[]> parseValues() {
             new Object[]{"8 years 2 mons 3 days 04:05", Interval.of(8, 2, 3, 4, 5, 0, 0)},
             new Object[]{"00:00:00", Interval.ZERO},
             new Object[]{"-1 years -2 mons +3 days -04:05:06", Interval.of(-1, -2, 3, -4, -5, -6, 0)},
+            new Object[]{"4 weeks", Interval.of(0, 0, 28, 0, 0, 0.0)},
+            new Object[]{"1 w 3 days", Interval.of(0, 0, 10, 0, 0, 0.0)},
+            new Object[]{"2 millenniums 4 years", Interval.of(2004, 0, 0, 0, 0, 0.0)},
+            new Object[]{"1 dec 8 yrs", Interval.of(18, 0, 0, 0, 0, 0.0)},
+            new Object[]{"2 c 2 decade", Interval.of(220, 0, 0, 0, 0, 0.0)},
+            new Object[]{"1 century 4 days", Interval.of(100, 0, 4, 0, 0, 0.0)},
 
             // intervalstyle=postgres_verbose
             new Object[]{"@ 3 days 4 hours 5 mins 6 secs", Interval.of(0, 0, 3, 4, 5, 6, 0)},