Add NOW() to PostgreSQL (#3403)

Co-authored-by: hfhbd <hfhbd@users.noreply.github.com>

dialects/postgresql/src/main/kotlin/app/cash/sqldelight/dialects/postgresql/PostgreSqlTypeResolver.kt

@@ -86,6 +86,7 @@ class PostgreSqlTypeResolver(private val parentResolver: TypeResolver) : TypeRes
     "max" -> encapsulatingType(exprList, SMALL_INT, PostgreSqlType.INTEGER, INTEGER, BIG_INT, REAL, TEXT, BLOB).asNullable()
     "min" -> encapsulatingType(exprList, BLOB, TEXT, SMALL_INT, INTEGER, PostgreSqlType.INTEGER, BIG_INT, REAL).asNullable()
     "date_trunc" -> encapsulatingType(exprList, TIMESTAMP_TIMEZONE, TIMESTAMP)
+    "now" -> IntermediateType(TIMESTAMP_TIMEZONE)
     else -> null
   }
 

dialects/postgresql/src/test/fixtures_postgresql/custom-functions/Test.s

@@ -0,0 +1,5 @@
+CREATE TABLE foo (
+bar TIMESTAMPTZ NOT NULL
+);
+
+SELECT NOW() AS now, date_trunc('hour', bar) AS d FROM foo;

sqldelight-gradle-plugin/src/test/integration-postgresql/src/main/sqldelight/app/cash/sqldelight/postgresql/integration/Dates.sq

@@ -12,3 +12,6 @@ RETURNING *;
 
 selectDateTrunc:
 SELECT date_trunc('hour', timestamp), date_trunc('hour', timestamp_with_timezone) FROM dates;
+
+selectNow:
+SELECT NOW();

sqldelight-gradle-plugin/src/test/integration-postgresql/src/test/kotlin/app/cash/sqldelight/postgresql/integration/PostgreSqlTest.kt

@@ -126,6 +126,12 @@ class PostgreSqlTest {
     }
   }
 
+  @Test fun now() {
+    val now = database.datesQueries.selectNow().executeAsOne()
+    assertThat(now).isNotNull()
+    assertThat(now).isGreaterThan(OffsetDateTime.MIN)
+  }
+
   @Test fun successfulOptimisticLock() {
     with(database.withLockQueries) {
       val row = insertText("sup").executeAsOne()