From ebd35c1122eafc08590f9523bc26a9311b9f3ec3 Mon Sep 17 00:00:00 2001
From: Hongze Zhang <hongze.zhang@intel.com>
Date: Fri, 25 Jun 2021 09:48:10 +0800
Subject: [PATCH] Add Gandiva functions for datetime (#23)

---
 cpp/src/gandiva/function_registry_datetime.cc | 25 ++++++++++++
 cpp/src/gandiva/precompiled/time.cc           | 40 +++++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/cpp/src/gandiva/function_registry_datetime.cc b/cpp/src/gandiva/function_registry_datetime.cc
index a5617c109515f..a5bc662530a19 100644
--- a/cpp/src/gandiva/function_registry_datetime.cc
+++ b/cpp/src/gandiva/function_registry_datetime.cc
@@ -148,6 +148,31 @@ std::vector<NativeFunction> GetDateTimeFunctionRegistry() {
 
       NativeFunction("castDATE", {}, DataTypeVector{timestamp()}, date32(),
                      kResultNullIfNull, "castDATE32_timestamp"),
+
+      NativeFunction("unix_date", {}, DataTypeVector{date32()}, int32(),
+                     kResultNullIfNull, "unix_date_date32"),
+
+      NativeFunction("unix_seconds", {}, DataTypeVector{timestampusutc()}, int64(),
+                     kResultNullIfNull, "unix_seconds_timestampusutc"),
+
+      NativeFunction("unix_millis", {}, DataTypeVector{timestampusutc()}, int64(),
+                     kResultNullIfNull, "unix_millis_timestampusutc"),
+
+      NativeFunction("unix_micros", {}, DataTypeVector{timestampusutc()}, int64(),
+                     kResultNullIfNull, "unix_micros_timestampusutc"),
+
+      NativeFunction("seconds_to_timestamp", {}, DataTypeVector{int64()}, timestampusutc(),
+                     kResultNullIfNull, "seconds_to_timestamp_int64"),
+
+      NativeFunction("millis_to_timestamp", {}, DataTypeVector{int64()}, timestampusutc(),
+                     kResultNullIfNull, "millis_to_timestamp_int64"),
+
+      NativeFunction("micros_to_timestamp", {}, DataTypeVector{int64()}, timestampusutc(),
+                     kResultNullIfNull, "micros_to_timestamp_int64"),
+
+      NativeFunction("date_diff", {}, DataTypeVector{date32(), date32()}, int32(),
+                     kResultNullIfNull, "micros_to_timestamp_date32_date32"),
+
       DATE_TYPES(LAST_DAY_SAFE_NULL_IF_NULL, last_day, {});
 
   return date_time_fn_registry_;
diff --git a/cpp/src/gandiva/precompiled/time.cc b/cpp/src/gandiva/precompiled/time.cc
index b9efb820836d5..8ce7d40f903c8 100644
--- a/cpp/src/gandiva/precompiled/time.cc
+++ b/cpp/src/gandiva/precompiled/time.cc
@@ -965,4 +965,44 @@ CAST_NULLABLE_INTERVAL_DAY(int64)
 CAST_NULLABLE_INTERVAL_YEAR(int32)
 CAST_NULLABLE_INTERVAL_YEAR(int64)
 
+FORCE_INLINE
+gdv_int32 unix_date_date32(gdv_date32 in) {
+  return in;
+}
+
+FORCE_INLINE
+gdv_int64 unix_seconds_timestampusutc(gdv_timestamp in) {
+  return in / 1000000;
+}
+
+FORCE_INLINE
+gdv_int64 unix_millis_timestampusutc(gdv_timestamp in) {
+  return in / 1000;
+}
+
+FORCE_INLINE
+gdv_int64 unix_micros_timestampusutc(gdv_timestamp in) {
+  return in;
+}
+
+FORCE_INLINE
+gdv_timestamp seconds_to_timestamp_int64(gdv_int64 in) {
+  return in * 1000000;
+}
+
+FORCE_INLINE
+gdv_timestamp millis_to_timestamp_int64(gdv_int64 in) {
+  return in * 1000;
+}
+
+FORCE_INLINE
+gdv_timestamp micros_to_timestamp_int64(gdv_int64 in) {
+  return in;
+}
+
+FORCE_INLINE
+gdv_int32 micros_to_timestamp_date32_date32(gdv_date32 left, gdv_date32 right) {
+  return left - right;
+}
+
 }  // extern "C"