beliefer commented on a change in pull request #25963: [SPARK-28137][SQL] Add
Postgresql function to_number.
URL: https://github.com/apache/spark/pull/25963#discussion_r336823433
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
##########
@@ -2267,6 +2267,156 @@ case class FormatNumber(x: Expression, d: Expression)
override def prettyName: String = "format_number"
}
+object ToNumber {
+ def transfer(input: UTF8String, pattern: UTF8String): UTF8String = {
+ val inputStr = input.toString
+ val patternStr =
pattern.toString.toUpperCase(Locale.ROOT).replaceAll("FM", "")
+ val hasSign = inputStr.startsWith("-") ||
+ (patternStr.contains('S') && inputStr.contains('-')) ||
+ (patternStr.contains("MI") && inputStr.contains('-')) ||
+ (patternStr.contains("PR") && inputStr.startsWith("<"))
+ val (newInputStr, newPatternStr) = if (hasSign) {
+ (inputStr.replaceAll("-|<|>", ""),
patternStr.replaceAll("S|(MI)|(PR)|(FM)", ""))
+ } else {
+ (inputStr, patternStr.replaceAll("FM", ""))
+ }
+ val inputChars = newInputStr.toCharArray()
+ val patternChars = newPatternStr.toIterator
+ val builder = new UTF8StringBuilder
+ var indexOfString = 0
+ var hasPoint = false
+ patternChars.foreach { c =>
+ if (newInputStr.length > indexOfString) {
+ val currentChar = inputChars(indexOfString)
+ c match {
+ case '9' | '0' if Character.isDigit(currentChar) =>
+ builder.append(newInputStr.substring(indexOfString, indexOfString
+ 1))
+ indexOfString += 1
+ case '9' | '0' | ' ' if currentChar == '.' =>
+ if (builder.build.numChars == 0) {
+ builder.append("0")
+ }
+ case '9' | '0' if currentChar == ',' =>
+ case '.' | 'D' if currentChar.equals('.') =>
+ hasPoint = true
+ builder.append(newInputStr.substring(indexOfString, indexOfString
+ 1))
+ indexOfString += 1
+ case ',' | 'G' if currentChar.equals(',') =>
+ indexOfString += 1
+ case ',' | 'G' if Character.isDigit(currentChar) =>
+ case 'L' =>
+ while (Character.isLetter(inputChars(indexOfString)) ||
+ inputChars(indexOfString) == '$') {
Review comment:
`indexOfString` from 0 to `inputChars.length - 1`. There exists one check.
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