mathyingzhou commented on a change in pull request #8648:
URL: https://github.com/apache/arrow/pull/8648#discussion_r565773246
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File path: cpp/src/arrow/adapters/orc/adapter_util.cc
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@@ -40,15 +44,21 @@ namespace orc {
using internal::checked_cast;
-// The number of nanoseconds in a second
+// The number of milliseconds, microseconds and nanoseconds in a second
+constexpr int64_t kOneSecondMillis = 1000LL;
+constexpr int64_t kOneMicroNanos = 1000LL;
+constexpr int64_t kOneSecondMicros = 1000000LL;
+constexpr int64_t kOneMilliNanos = 1000000LL;
constexpr int64_t kOneSecondNanos = 1000000000LL;
+// Jan 1st 2015 in UNIX timestamp
+// constexpr int64_t kConverter = 1420070400LL;
Review comment:
Ah I need to remove them. They turn out to be useless.
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