Core: Support parse Date64 which contains nano seconds (#258)

* Core: Support parse Date64 which contains nano seconds

* nit

Author: pan3793

clickhouse-core/src/main/scala/xenon/clickhouse/Utils.scala

@@ -21,7 +21,9 @@ import java.math.{MathContext, RoundingMode}
 import java.net.URI
 import java.nio.file.{Files, Path, StandardCopyOption}
 import java.time.Duration
-import java.time.format.DateTimeFormatter
+import java.time.chrono.IsoChronology
+import java.time.format.{DateTimeFormatter, DateTimeFormatterBuilder, ResolverStyle}
+import java.time.temporal.ChronoField
 import java.util.Locale
 import java.util.concurrent.TimeUnit.NANOSECONDS
 import java.util.concurrent.locks.LockSupport
@@ -33,7 +35,18 @@ import scala.util.{Failure, Success, Try}
 object Utils extends Logging {
 
   @transient lazy val dateFmt: DateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd")
-  @transient lazy val dateTimeFmt: DateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
+  @transient lazy val dateTimeFmt: DateTimeFormatter = new DateTimeFormatterBuilder()
+    .parseCaseInsensitive()
+    .append(DateTimeFormatter.ISO_LOCAL_DATE)
+    .appendLiteral(' ')
+    .appendValue(ChronoField.HOUR_OF_DAY, 2).appendLiteral(':')
+    .appendValue(ChronoField.MINUTE_OF_HOUR, 2).appendLiteral(':')
+    .appendValue(ChronoField.SECOND_OF_MINUTE, 2)
+    .appendFraction(ChronoField.NANO_OF_SECOND, 0, 9, true)
+    .toFormatter(Locale.US)
+    .withChronology(IsoChronology.INSTANCE)
+    .withResolverStyle(ResolverStyle.STRICT)
+
   @transient lazy val legacyDateFmt: FastDateFormat = FastDateFormat.getInstance("yyyy-MM-dd")
   @transient lazy val legacyDateTimeFmt: FastDateFormat = FastDateFormat.getInstance("yyyy-MM-dd HH:mm:ss")
 

clickhouse-core/src/test/scala/xenon/clickhouse/UtilsSuite.scala

@@ -17,7 +17,7 @@ package xenon.clickhouse
 import org.scalatest.funsuite.AnyFunSuite
 import xenon.clickhouse.Utils._
 
-import java.time.Duration
+import java.time.{Duration, LocalDateTime}
 
 class UtilsSuite extends AnyFunSuite {
 
@@ -61,4 +61,10 @@ class UtilsSuite extends AnyFunSuite {
     }
     assert(counter == 1)
   }
+
+  test("parse date with nano seconds") {
+    val actual = LocalDateTime.parse("2023-03-29 15:25:25.977", Utils.dateTimeFmt)
+    val expected = LocalDateTime.of(2023, 3, 29, 15, 25, 25, 977000000)
+    assert(actual === expected)
+  }
 }