[GitHub] [arrow] siddhantrao23 commented on a diff in pull request #12581: ARROW-15940: [Gandiva][C++] Add NEGATIVE function for decimal data type

[GitBox <gi...@apache.org>]

siddhantrao23 commented on code in PR #12581:
URL: https://github.com/apache/arrow/pull/12581#discussion_r856247010


##########
cpp/src/gandiva/precompiled/arithmetic_ops_test.cc:
##########
@@ -80,6 +83,35 @@ TEST(TestArithmeticOps, TestMod) {
   EXPECT_FALSE(context.has_error());
 }
 
+TEST(TestArithmeticOps, TestNegativeDecimal) {
+  gandiva::ExecutionContext ctx;
+  int64_t ctx_ptr = reinterpret_cast<int64_t>(&ctx);
+
+  int64_t out_high_bits = 0;
+  uint64_t out_low_bits = 0;
+
+  arrow::Decimal128 input_decimal("-10.5");
+  negative_decimal(ctx_ptr, input_decimal.high_bits(), input_decimal.low_bits(), 3, 1, 3,
+                   1, &out_high_bits, &out_low_bits);
+  arrow::Decimal128 output_decimal("10.5");
+  EXPECT_EQ(output_decimal.high_bits(), out_high_bits);
+  EXPECT_EQ(output_decimal.low_bits(), out_low_bits);
+
+  arrow::Decimal128 input_decimal2("10.5");
+  negative_decimal(ctx_ptr, input_decimal2.high_bits(), input_decimal2.low_bits(), 3, 1,
+                   3, 1, &out_high_bits, &out_low_bits);
+  arrow::Decimal128 output_decimal2("-10.5");
+  EXPECT_EQ(output_decimal2.high_bits(), out_high_bits);
+  EXPECT_EQ(output_decimal2.low_bits(), out_low_bits);
+
+  arrow::Decimal128 input_decimal3("-23049223942343.532412");
+  negative_decimal(ctx_ptr, input_decimal3.high_bits(), input_decimal3.low_bits(), 20, 6,
+                   20, 6, &out_high_bits, &out_low_bits);
+  arrow::Decimal128 output_decimal3("23049223942343.532412");
+  EXPECT_EQ(output_decimal3.high_bits(), out_high_bits);
+  EXPECT_EQ(output_decimal3.low_bits(), out_low_bits);
+}

Review Comment:
   Could you add some unit tests for decimals with 0 scale/precision?



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