From d11c1102a0a13bb2f3057c9b4c52e268620a32c0 Mon Sep 17 00:00:00 2001
From: Thomas Li <47963215+lithomas1@users.noreply.github.com>
Date: Sun, 26 Nov 2023 11:46:36 -0500
Subject: [PATCH 1/3] Backport PR #56114: CLN: Get rid of PyArray_GetCastFunc

---
 .../src/vendored/ujson/python/objToJSON.c     | 42 ++++++++-----------
 1 file changed, 17 insertions(+), 25 deletions(-)

diff --git a/pandas/_libs/src/vendored/ujson/python/objToJSON.c b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
index 1fa82215179a8..67ac82fe349c3 100644
--- a/pandas/_libs/src/vendored/ujson/python/objToJSON.c
+++ b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
@@ -1306,14 +1306,7 @@ char **NpyArr_encodeLabels(PyArrayObject *labels, PyObjectEncoder *enc,
         NPY_DATETIMEUNIT dateUnit = NPY_FR_ns;
         if (PyTypeNum_ISDATETIME(type_num)) {
             is_datetimelike = 1;
-            PyArray_VectorUnaryFunc *castfunc =
-                PyArray_GetCastFunc(PyArray_DescrFromType(type_num), NPY_INT64);
-            if (!castfunc) {
-                PyErr_Format(PyExc_ValueError,
-                             "Cannot cast numpy dtype %d to long",
-                             enc->npyType);
-            }
-            castfunc(dataptr, &i8date, 1, NULL, NULL);
+            i8date = *(npy_int64 *)dataptr;
             dateUnit = get_datetime_metadata_from_dtype(dtype).base;
         } else if (PyDate_Check(item) || PyDelta_Check(item)) {
             is_datetimelike = 1;
@@ -1444,24 +1437,23 @@ void Object_beginTypeContext(JSOBJ _obj, JSONTypeContext *tc) {
         return;
     }
 
-    pc = createTypeContext();
-    if (!pc) {
-        tc->type = JT_INVALID;
-        return;
-    }
-    tc->prv = pc;
+  pc = createTypeContext();
+  if (!pc) {
+    tc->type = JT_INVALID;
+    return;
+  }
+  tc->prv = pc;
 
-    if (PyTypeNum_ISDATETIME(enc->npyType)) {
-        int64_t longVal;
-        PyArray_VectorUnaryFunc *castfunc =
-            PyArray_GetCastFunc(PyArray_DescrFromType(enc->npyType), NPY_INT64);
-        if (!castfunc) {
-            PyErr_Format(PyExc_ValueError, "Cannot cast numpy dtype %d to long",
-                         enc->npyType);
-        }
-        castfunc(enc->npyValue, &longVal, 1, NULL, NULL);
-        if (longVal == get_nat()) {
-            tc->type = JT_NULL;
+  if (PyTypeNum_ISDATETIME(enc->npyType)) {
+    int64_t longVal;
+
+    longVal = *(npy_int64 *)enc->npyValue;
+    if (longVal == get_nat()) {
+      tc->type = JT_NULL;
+    } else {
+      if (enc->datetimeIso) {
+        if (enc->npyType == NPY_TIMEDELTA) {
+          pc->PyTypeToUTF8 = NpyTimeDeltaToIsoCallback;
         } else {
             if (enc->datetimeIso) {
                 if (enc->npyType == NPY_TIMEDELTA) {

From 1a24149e80521a9c5ccf43d83b49c6c98c7fcbad Mon Sep 17 00:00:00 2001
From: Thomas Li <47963215+lithomas1@users.noreply.github.com>
Date: Sun, 3 Dec 2023 23:56:06 -0500
Subject: [PATCH 2/3] fix bad indent?

---
 .../src/vendored/ujson/python/objToJSON.c     | 30 +++++++++----------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/pandas/_libs/src/vendored/ujson/python/objToJSON.c b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
index 67ac82fe349c3..f54c117d3896e 100644
--- a/pandas/_libs/src/vendored/ujson/python/objToJSON.c
+++ b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
@@ -1437,23 +1437,23 @@ void Object_beginTypeContext(JSOBJ _obj, JSONTypeContext *tc) {
         return;
     }
 
-  pc = createTypeContext();
-  if (!pc) {
-    tc->type = JT_INVALID;
-    return;
-  }
-  tc->prv = pc;
+    pc = createTypeContext();
+    if (!pc) {
+        tc->type = JT_INVALID;
+        return;
+    }
+    tc->prv = pc;
 
-  if (PyTypeNum_ISDATETIME(enc->npyType)) {
-    int64_t longVal;
+    if (PyTypeNum_ISDATETIME(enc->npyType)) {
+        int64_t longVal;
 
-    longVal = *(npy_int64 *)enc->npyValue;
-    if (longVal == get_nat()) {
-      tc->type = JT_NULL;
-    } else {
-      if (enc->datetimeIso) {
-        if (enc->npyType == NPY_TIMEDELTA) {
-          pc->PyTypeToUTF8 = NpyTimeDeltaToIsoCallback;
+        longVal = *(npy_int64 *)enc->npyValue;
+        if (longVal == get_nat()) {
+        tc->type = JT_NULL;
+        } else {
+        if (enc->datetimeIso) {
+            if (enc->npyType == NPY_TIMEDELTA) {
+            pc->PyTypeToUTF8 = NpyTimeDeltaToIsoCallback;
         } else {
             if (enc->datetimeIso) {
                 if (enc->npyType == NPY_TIMEDELTA) {

From 57f7b640d75cb0025a37e01c3b2a92b1612faebe Mon Sep 17 00:00:00 2001
From: Thomas Li <47963215+lithomas1@users.noreply.github.com>
Date: Mon, 4 Dec 2023 00:03:14 -0500
Subject: [PATCH 3/3] remove more unintended changes

---
 pandas/_libs/src/vendored/ujson/python/objToJSON.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/pandas/_libs/src/vendored/ujson/python/objToJSON.c b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
index f54c117d3896e..912b0405d0800 100644
--- a/pandas/_libs/src/vendored/ujson/python/objToJSON.c
+++ b/pandas/_libs/src/vendored/ujson/python/objToJSON.c
@@ -1449,11 +1449,7 @@ void Object_beginTypeContext(JSOBJ _obj, JSONTypeContext *tc) {
 
         longVal = *(npy_int64 *)enc->npyValue;
         if (longVal == get_nat()) {
-        tc->type = JT_NULL;
-        } else {
-        if (enc->datetimeIso) {
-            if (enc->npyType == NPY_TIMEDELTA) {
-            pc->PyTypeToUTF8 = NpyTimeDeltaToIsoCallback;
+            tc->type = JT_NULL;
         } else {
             if (enc->datetimeIso) {
                 if (enc->npyType == NPY_TIMEDELTA) {