Moved commit "Fixed ToBytes/FromBytes for decimal & big tz dates" from ydb repo

Author: vitstn

src/library/yql_common/decimal/yql_decimal.cpp

@@ -17,11 +17,11 @@ TUint128 GetDivider(ui8 scale) {
 }
 
 bool IsError(TInt128 v) {
-    return v > Nan() || v < -Nan();
+    return v > Nan() || v < -Inf();
 }
 
 bool IsNan(TInt128 v) {
-    return v == Nan() || v == -Nan();
+    return v == Nan();
 }
 
 bool IsInf(TInt128 v) {
@@ -47,8 +47,6 @@ const char* ToString(TInt128 val, ui8 precision, ui8 scale) {
         return "-inf";
     if (val == Nan())
         return "nan";
-    if (val == -Nan())
-        return "-nan";
 
     if (!IsNormal(val)) {
         return nullptr;

tests/unit/library/yql_common/decimal/yql_decimal_ut.cpp

@@ -230,19 +230,16 @@ Y_UNIT_TEST_SUITE(TYqlDecimalTest) {
     }
 
     Y_UNIT_TEST(TestSpecialAsString) {
-        UNIT_ASSERT(IsValid("+Nan"));
-        UNIT_ASSERT(IsValid("-nAn"));
+        UNIT_ASSERT(IsValid("Nan"));
         UNIT_ASSERT(IsValid("INF"));
         UNIT_ASSERT(IsValid("-inf"));
 
-        UNIT_ASSERT_VALUES_EQUAL(ToString(+Nan(), 10, 2), "nan");
-        UNIT_ASSERT_VALUES_EQUAL(ToString(-Nan(), 10, 2), "-nan");
+        UNIT_ASSERT_VALUES_EQUAL(ToString(Nan(), 10, 2), "nan");
 
         UNIT_ASSERT_VALUES_EQUAL(ToString(+Inf(), 10, 2), "inf");
         UNIT_ASSERT_VALUES_EQUAL(ToString(-Inf(), 10, 2), "-inf");
 
         UNIT_ASSERT(IsNan(FromString("nan", 10, 2)));
-        UNIT_ASSERT(IsNan(FromString("-nAN", 12, 7)));
         UNIT_ASSERT(IsInf(FromString("+INf", MaxPrecision, 6)));
         UNIT_ASSERT(IsInf(FromString("-inF", 4, 2)));
     }