caicancai commented on code in PR #3904:
URL: https://github.com/apache/calcite/pull/3904#discussion_r1710918810
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core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -1076,15 +1076,39 @@ public static String substring(String c, int s, int l) {
}
public static String substring(String c, int s, long l) {
- return substring(c, s, clamp(l));
+ if (s < 0) {
+ if (l > 0 && l + s > 0) {
+ l += s;
+ return substring(c, 0, l);
+ }
+ }
+ int l0 = clamp(l);
+ return SqlFunctions.substring(c, s, l0);
}
public static String substring(String c, long s, int l) {
- return substring(c, clamp(s), l);
+ if (s < 0) {
Review Comment:
`return s < 0 ? (s += l) > 0 ? substring(c, 0, s) : "" : /* your else case
here */; `
Better？
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