feat(sqlite): add quarter granularity support using CASE expression

- Implement quarter granularity in SqliteQuery with explicit CASE
  to map months to their respective quarter start dates.
- Aligns SQLite quarter handling with Postgres DATE_TRUNC('quarter', ...)
- Fixes issues with data blending queries requiring quarter granularity.

Author: raosudheesh

packages/cubejs-schema-compiler/src/adapter/SqliteQuery.ts

@@ -10,7 +10,14 @@ const GRANULARITY_TO_INTERVAL = {
   minute: (date) => `strftime('%Y-%m-%dT%H:%M:00.000', ${date})`,
   second: (date) => `strftime('%Y-%m-%dT%H:%M:%S.000', ${date})`,
   month: (date) => `strftime('%Y-%m-01T00:00:00.000', ${date})`,
-  year: (date) => `strftime('%Y-01-01T00:00:00.000', ${date})`
+  year: (date) => `strftime('%Y-01-01T00:00:00.000', ${date})`,
+  quarter: (date) =>
+    `CASE
+      WHEN cast(strftime('%m', ${date}) as integer) BETWEEN 1 AND 3 THEN strftime('%Y-01-01T00:00:00.000', ${date})
+      WHEN cast(strftime('%m', ${date}) as integer) BETWEEN 4 AND 6 THEN strftime('%Y-04-01T00:00:00.000', ${date})
+      WHEN cast(strftime('%m', ${date}) as integer) BETWEEN 7 AND 9 THEN strftime('%Y-07-01T00:00:00.000', ${date})
+      ELSE strftime('%Y-10-01T00:00:00.000', ${date})
+    END`.trim()
 };
 
 class SqliteFilter extends BaseFilter {