Data update

Task/Test-integerness/DuckDB/test-integerness-1.duckdb

@@ -0,0 +1,3 @@
+create type Complex as struct (r float, i float);
+
+create type Rational as struct (n integer, d integer);

Task/Test-integerness/DuckDB/test-integerness-2.duckdb

@@ -0,0 +1,16 @@
+create or replace function number_integerp(x) as (
+  x = trunc(x)
+);
+
+# Return true iff x has the type signature of a Rational
+# with the denominator dividing the numerator evenly.
+create or replace function rational_integerp(x) as (
+   typeof(x) = 'STRUCT(n INTEGER, d INTEGER)'
+   and x.n % x.d = 0
+);
+
+# Return true if x can be cast to a Complex with
+# the imaginary part equal to 0 and an integer real part.
+create or replace function complex_integerp(x) as (
+  (x::Complex).i = 0 and number_integerp(x.r)
+);