Support trunc function for python script

[waynexia]

What type of enhancement is this?

User experience

What does the enhancement do?

trunc is temporarily removed in #2659 due to the signature change. We should find another way to support it again.

Implementation challenges

No response

[tisonkun]

due to the signature change

Could you elaborate it a bit? From what to what, and why it breaks things ..

[waynexia]

Related change: https://github.com/GreptimeTeam/greptimedb/pull/2659/files#diff-329ba8f324e7dc1c3dbb07f61662e867afdd61d40abce9b44a3fd73ada219b11R556-R561

[tisonkun]

@waynexia Yeah I found the linked PR. It's a huge one and the related line seems:

diff --git a/src/script/src/python/pyo3/builtins.rs b/src/script/src/python/pyo3/builtins.rs
index 20d1c364415..6051a5307b9 100644
--- a/src/script/src/python/pyo3/builtins.rs
+++ b/src/script/src/python/pyo3/builtins.rs
@@ -90,7 +90,7 @@ pub(crate) fn greptime_builtins(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
             floor,
             ceil,
             round,
-            trunc,
+            // trunc,
             abs,
             signum,
             exp,
@@ -281,7 +281,8 @@ fn sqrt(py: Python<'_>, val: PyObject) -> PyResult<PyObject> {
 */
 bind_call_unary_math_function!(
-    sqrt, sin, cos, tan, asin, acos, atan, floor, ceil, trunc, abs, signum, exp, ln, log2, log10
+    sqrt, sin, cos, tan, asin, acos, atan, floor, ceil, abs, signum, exp, ln, log2,
+    log10 // trunc,
 );

Not quite a useful info.