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new 1a7a2f7a889f [SPARK-46488][SQL] Skipping trimAll call during timestamp
parsing
1a7a2f7a889f is described below
commit 1a7a2f7a889fe0270318b304cd50c148729dd90b
Author: Stefan Kandic <stefan.kan...@databricks.com>
AuthorDate: Mon Dec 25 19:41:10 2023 +0300
[SPARK-46488][SQL] Skipping trimAll call during timestamp parsing
### What changes were proposed in this pull request?
This PR is a follow up to
[46173](https://github.com/apache/spark/pull/44110) which added skipping the
trimAll calls during date parsing.
Now I'm doing the same just for timestamp parsing.
### Why are the changes needed?
These changes should drastically improve edge case where input string in
cast to date has many whitespace as prefix/sufix.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
I added the tests to check for cases with prefixes and suffixes of
whitespaces and control chars.
Also there are benchmark tests in the previous
[PR](https://github.com/apache/spark/pull/44110)
### Was this patch authored or co-authored using generative AI tooling?
No
Closes #44463 from stefankandic/str2timeStamp-skipTrim.
Authored-by: Stefan Kandic <stefan.kan...@databricks.com>
Signed-off-by: Max Gekk <max.g...@gmail.com>
---
.../sql/catalyst/util/SparkDateTimeUtils.scala | 66 ++++++++++++++++------
.../sql/catalyst/util/DateTimeUtilsSuite.scala | 43 +++++++++-----
2 files changed, 79 insertions(+), 30 deletions(-)
diff --git
a/sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala
b/sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala
index 35118b449e2f..ed4d68f553f1 100644
---
a/sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala
+++
b/sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala
@@ -315,18 +315,11 @@ trait SparkDateTimeUtils {
var currentSegmentValue = 0
var currentSegmentDigits = 0
val bytes = s.getBytes
- var j = 0
- var strEndTrimmed = bytes.length
+ var j = getTrimmedStart(bytes)
+ val strEndTrimmed = getTrimmedEnd(j, bytes)
- while (j < bytes.length && UTF8String.isWhitespaceOrISOControl(bytes(j))) {
- j += 1;
- }
- if (j == bytes.length) {
- return None;
- }
-
- while (strEndTrimmed > j &&
UTF8String.isWhitespaceOrISOControl(bytes(strEndTrimmed - 1))) {
- strEndTrimmed -= 1;
+ if (j == strEndTrimmed) {
+ return None
}
if (bytes(j) == '-' || bytes(j) == '+') {
@@ -418,7 +411,7 @@ trait SparkDateTimeUtils {
(segment == 7 && digits <= 2) ||
(segment != 0 && segment != 6 && segment != 7 && digits > 0 && digits
<= 2)
}
- if (s == null || s.trimAll().numBytes() == 0) {
+ if (s == null) {
return (Array.empty, None, false)
}
var tz: Option[String] = None
@@ -426,8 +419,14 @@ trait SparkDateTimeUtils {
var i = 0
var currentSegmentValue = 0
var currentSegmentDigits = 0
- val bytes = s.trimAll().getBytes
- var j = 0
+ val bytes = s.getBytes
+ var j = getTrimmedStart(bytes)
+ val strEndTrimmed = getTrimmedEnd(j, bytes)
+
+ if (j == strEndTrimmed) {
+ return (Array.empty, None, false)
+ }
+
var digitsMilli = 0
var justTime = false
var yearSign: Option[Int] = None
@@ -435,7 +434,7 @@ trait SparkDateTimeUtils {
yearSign = if (bytes(j) == '-') Some(-1) else Some(1)
j += 1
}
- while (j < bytes.length) {
+ while (j < strEndTrimmed) {
val b = bytes(j)
val parsedValue = b - '0'.toByte
if (parsedValue < 0 || parsedValue > 9) {
@@ -504,8 +503,8 @@ trait SparkDateTimeUtils {
currentSegmentValue = 0
currentSegmentDigits = 0
i += 1
- tz = Some(new String(bytes, j, bytes.length - j))
- j = bytes.length - 1
+ tz = Some(new String(bytes, j, strEndTrimmed - j))
+ j = strEndTrimmed - 1
}
if (i == 6 && b != '.') {
i += 1
@@ -619,6 +618,39 @@ trait SparkDateTimeUtils {
case NonFatal(_) => None
}
}
+
+ /**
+ * Returns the index of the first non-whitespace and non-ISO control
character in the byte array.
+ *
+ * @param bytes The byte array to be processed.
+ * @return The start index after trimming.
+ */
+ @inline private def getTrimmedStart(bytes: Array[Byte]) = {
+ var start = 0
+
+ while (start < bytes.length &&
UTF8String.isWhitespaceOrISOControl(bytes(start))) {
+ start += 1
+ }
+
+ start
+ }
+
+ /**
+ * Returns the index of the last non-whitespace and non-ISO control
character in the byte array.
+ *
+ * @param start The starting index for the search.
+ * @param bytes The byte array to be processed.
+ * @return The end index after trimming.
+ */
+ @inline private def getTrimmedEnd(start: Int, bytes: Array[Byte]) = {
+ var end = bytes.length - 1
+
+ while (end > start && UTF8String.isWhitespaceOrISOControl(bytes(end))) {
+ end -= 1
+ }
+
+ end + 1
+ }
}
object SparkDateTimeUtils extends SparkDateTimeUtils
diff --git
a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/DateTimeUtilsSuite.scala
b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/DateTimeUtilsSuite.scala
index c4e578ee2a51..c4f6e4d6ed0e 100644
---
a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/DateTimeUtilsSuite.scala
+++
b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/DateTimeUtilsSuite.scala
@@ -128,23 +128,26 @@ class DateTimeUtilsSuite extends SparkFunSuite with
Matchers with SQLHelper {
}
test("SPARK-32559: string to date trim Control Characters") {
- Seq("2015-03-18", "2015-03-18T123321", " 2015-03-18 123321", "+2015-03-18")
- .foreach {
- input => Seq(input, "\u0003", "\u0003", " ", " ")
- .permutations.map(p => p.mkString).foreach {
- s => assert(toDate(s).get === days(2015, 3, 18))
- }
+ val expected = days(2015, 3, 18)
+ permuteWithWhitespaceAndControl(
+ "2015-03-18", "2015-03-18T123321", " 2015-03-18 123321", "+2015-03-18"
+ ).foreach { s =>
+ assert(toDate(s).get === expected)
}
- Seq("INVALID_INPUT", " ", "1999-08-", "2015-03-18\u0003123321",
"2015-03-18Q123321")
- .foreach {
- input =>
- Seq(input, "\u0003", "\u0003", " ", " ").permutations.map(p =>
p.mkString).foreach {
- s => assert(toDate(s).isEmpty)
- }
- }
+ permuteWithWhitespaceAndControl(
+ "INVALID_INPUT", " ", "1999-08-", "2015-03-18\u0003123321",
"2015-03-18Q123321"
+ ).foreach { s =>
+ assert(toDate(s).isEmpty)
+ }
}
+ private def permuteWithWhitespaceAndControl(values: String*): Seq[String] =
+ values.flatMap { input =>
+ Seq(input, "\u0003", "\u0003", " ", " ")
+ .permutations.map(_.mkString)
+ }
+
test("string to date") {
assert(toDate("2015-01-28").get === days(2015, 1, 28))
assert(toDate("2015").get === days(2015, 1, 1))
@@ -337,6 +340,20 @@ class DateTimeUtilsSuite extends SparkFunSuite with
Matchers with SQLHelper {
zoneId = getZoneId("Europe/Moscow")
expected = Option(date(2015, 3, 18, 12, 3, 17, 123456, zid = zoneId))
checkStringToTimestamp("2015-03-18T12:03:17.123456 Europe/Moscow",
expected)
+
+ // Check whitespace and control character permutations
+ expected = Option(date(2015, 3, 18, 12, 3, 17, zid = zid))
+ permuteWithWhitespaceAndControl(
+ "2015-03-18 12:03:17", "2015-03-18T12:03:17"
+ ).foreach { s =>
+ checkStringToTimestamp(s, expected)
+ }
+
+ permuteWithWhitespaceAndControl(
+ "INVALID_INPUT", "\t", "", "2015-03-18\u000312:03:17", "2015-03-18
12:", "2015-03-18 123"
+ ).foreach { s =>
+ checkStringToTimestamp(s, None)
+ }
}
}
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