GH-48866: [C++][Gandiva] Truncate subseconds beyond milliseconds in castTIMESTAMP_utf8 and castTIME_utf8

Author: akravchukdremio

cpp/src/gandiva/precompiled/time.cc

@@ -747,11 +747,12 @@ gdv_timestamp castTIMESTAMP_utf8(int64_t context, const char* input, gdv_int32 l
 
   // adjust the milliseconds
   if (sub_seconds_len > 0) {
-    if (sub_seconds_len > 3) {
-      const char* msg = "Invalid millis for timestamp value ";
-      set_error_for_date(length, input, msg, context);
-      return 0;
+    // Truncate to 3 digits (milliseconds precision) if more digits are provided
+    while (sub_seconds_len > 3) {
+      ts_fields[TimeFields::kSubSeconds] /= 10;
+      sub_seconds_len--;
     }
+    // Pad with zeros if less than 3 digits
     while (sub_seconds_len < 3) {
       ts_fields[TimeFields::kSubSeconds] *= 10;
       sub_seconds_len++;
@@ -867,12 +868,12 @@ gdv_time32 castTIME_utf8(int64_t context, const char* input, int32_t length) {
 
   // adjust the milliseconds
   if (sub_seconds_len > 0) {
-    if (sub_seconds_len > 3) {
-      const char* msg = "Invalid millis for time value ";
-      set_error_for_date(length, input, msg, context);
-      return 0;
+    // Truncate to 3 digits (milliseconds precision) if more digits are provided
+    while (sub_seconds_len > 3) {
+      time_fields[TimeFields::kSubSeconds - TimeFields::kHours] /= 10;
+      sub_seconds_len--;
     }
-
+    // Pad with zeros if less than 3 digits
     while (sub_seconds_len < 3) {
       time_fields[TimeFields::kSubSeconds - TimeFields::kHours] *= 10;
       sub_seconds_len++;

cpp/src/gandiva/precompiled/time_test.cc

@@ -122,15 +122,26 @@ TEST(TestTime, TestCastTimestamp) {
             "Not a valid time for timestamp value 2000-01-01 00:00:100");
   context.Reset();
 
-  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.0001", 24), 0);
-  EXPECT_EQ(context.get_error(),
-            "Invalid millis for timestamp value 2000-01-01 00:00:00.0001");
-  context.Reset();
-
-  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.1000", 24), 0);
-  EXPECT_EQ(context.get_error(),
-            "Invalid millis for timestamp value 2000-01-01 00:00:00.1000");
-  context.Reset();
+  // Test truncation of subseconds to 3 digits (milliseconds)
+  // "2000-01-01 00:00:00.0001" should truncate to "2000-01-01 00:00:00.000"
+  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.0001", 24),
+            castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.000", 23));
+
+  // "2000-01-01 00:00:00.1000" should truncate to "2000-01-01 00:00:00.100"
+  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.1000", 24),
+            castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.100", 23));
+
+  // "2000-01-01 00:00:00.123456789" should truncate to "2000-01-01 00:00:00.123"
+  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.123456789", 29),
+            castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.123", 23));
+
+  // "2000-01-01 00:00:00.1999" should truncate to "2000-01-01 00:00:00.199"
+  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.1999", 24),
+            castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.199", 23));
+
+  // "2000-01-01 00:00:00.1994" should truncate to "2000-01-01 00:00:00.199"
+  EXPECT_EQ(castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.1994", 24),
+            castTIMESTAMP_utf8(context_ptr, "2000-01-01 00:00:00.199", 23));
 }
 
 TEST(TestTime, TestCastTimeUtf8) {
@@ -166,13 +177,26 @@ TEST(TestTime, TestCastTimeUtf8) {
   EXPECT_EQ(context.get_error(), "Not a valid time value 00:00:100");
   context.Reset();
 
-  EXPECT_EQ(castTIME_utf8(context_ptr, "00:00:00.0001", 13), 0);
-  EXPECT_EQ(context.get_error(), "Invalid millis for time value 00:00:00.0001");
-  context.Reset();
+  // Test truncation of subseconds to 3 digits (milliseconds)
+  // "00:00:00.0001" should truncate to "00:00:00.000"
+  EXPECT_EQ(castTIME_utf8(context_ptr, "00:00:00.0001", 13),
+            castTIME_utf8(context_ptr, "00:00:00.000", 12));
 
-  EXPECT_EQ(castTIME_utf8(context_ptr, "00:00:00.1000", 13), 0);
-  EXPECT_EQ(context.get_error(), "Invalid millis for time value 00:00:00.1000");
-  context.Reset();
+  // "00:00:00.1000" should truncate to "00:00:00.100"
+  EXPECT_EQ(castTIME_utf8(context_ptr, "00:00:00.1000", 13),
+            castTIME_utf8(context_ptr, "00:00:00.100", 12));
+
+  // "9:45:30.123456789" should truncate to "9:45:30.123"
+  EXPECT_EQ(castTIME_utf8(context_ptr, "9:45:30.123456789", 17),
+            castTIME_utf8(context_ptr, "9:45:30.123", 11));
+
+  // "00:00:00.1999" should truncate to "00:00:00.199"
+  EXPECT_EQ(castTIME_utf8(context_ptr, "00:00:00.1999", 13),
+            castTIME_utf8(context_ptr, "00:00:00.199", 12));
+
+  // "00:00:00.1994" should truncate to "00:00:00.199"
+  EXPECT_EQ(castTIME_utf8(context_ptr, "00:00:00.1994", 13),
+            castTIME_utf8(context_ptr, "00:00:00.199", 12));
 }
 
 #ifndef _WIN32