JoshRosen commented on code in PR #46894:
URL: https://github.com/apache/spark/pull/46894#discussion_r1630217950
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalogUtils.scala:
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@@ -63,22 +63,26 @@ object ExternalCatalogUtils {
bitSet
}
- def needsEscaping(c: Char): Boolean = {
+ @inline private final def needsEscaping(c: Char): Boolean = {
Review Comment:
I wonder whether something like
```scala
def escapePathName(path: String): String = {
var builder: StringBuilder = null
var i = 0
while (i < path.length) {
val c = path.charAt(i)
if (c < charToEscape.size() && charToEscape.get(c)) {
// Character needs escaping:
if (builder eq null) {
builder = new StringBuilder(path.substring(0, i))
}
builder.append('%')
builder.append(f"${c.asInstanceOf[Int]}%02X")
} else {
// Character does not need escaping:
builder.append(c)
}
i += 1
}
if (builder eq null) {
path
} else {
builder.toString()
}
}
```
could be faster since it would avoid StringOps function calls for
`indexWhere` plus function calls in `.foreach`. I think the cost of the builder
null checks in the loop should be pretty cheap, although I can also appreciate
how those checks might potentially impact loop unrolling. I think my suggestion
should wind up being faster than what you have, even if it's not the
theoretically fastest possible solution.
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