chenhao7253886 commented on a change in pull request #1445: Add string function
split_part
URL: https://github.com/apache/incubator-doris/pull/1445#discussion_r301363914
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File path: be/src/exprs/string_functions.cpp
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@@ -761,4 +761,61 @@ StringVal StringFunctions::money_format(FunctionContext
*context, const LargeInt
return do_money_format(context, ss.str());
}
+static int indexOf(const uint8_t* source, int sourceOffset, int sourceCount,
+ const uint8_t* target, int targetOffset, int targetCount,
+ int fromIndex) {
+ if (fromIndex >= sourceCount) {
+ return (targetCount == 0 ? sourceCount : -1);
+ }
+ if (fromIndex < 0) {
+ fromIndex = 0;
+ }
+ if (targetCount == 0) {
+ return fromIndex;
+ }
+ const uint8_t first = target[targetOffset];
+ int max = sourceOffset + (sourceCount - targetCount);
+ for (int i = sourceOffset + fromIndex; i <= max; i++) {
+ if (source[i] != first) { // Look for first character
+ while (++i <= max && source[i] != first);
+ }
+ if (i <= max) { // Found first character, now look at the rest of v2
+ int j = i + 1;
+ int end = j + targetCount - 1;
+ for (int k = targetOffset + 1; j < end && source[j] == target[k];
j++, k++);
+ if (j == end) {
+ return i - sourceOffset; // Found whole string.
+ }
+ }
+ }
+ return -1;
+}
+
+
+StringVal StringFunctions::split_part(FunctionContext* context,const
StringVal& content,
+ const StringVal& delimiter,const IntVal&
field) {
+ if (field.val <= 0) return StringVal::null();
Review comment:
What if content、delimiter or field is null？
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