vlsi commented on a change in pull request #800: [CALCITE-2460][CALCITE-2459]
Add implementation of To_Base64 and From_Base64 to SqlFunctions
URL: https://github.com/apache/calcite/pull/800#discussion_r297186609
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File path: core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java
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@@ -123,6 +129,39 @@
private SqlFunctions() {
}
+ /** SQL TO_BASE64(string) function. */
+ public static String toBase64(String string) {
+ return toBase64_(string.getBytes(UTF_8));
+ }
+
+ /** SQL TO_BASE64(string) function for binary string. */
+ public static String toBase64(ByteString string) {
+ return toBase64_(string.getBytes());
+ }
+
+ private static String toBase64_(byte[] bytes) {
+ String base64 = Base64.getEncoder().encodeToString(bytes);
+ StringBuilder str = new StringBuilder(base64.length() + base64.length() /
76);
+ if (base64.length() > 76) {
+ Splitter.fixedLength(76).split(base64).iterator().forEachRemaining(s -> {
+ str.append(s);
+ str.append("\n");
+ });
+ return str.substring(0, str.length() - 1);
+ }
+ return base64;
+ }
+
+ /** SQL FROM_BASE64(string) function. */
+ public static ByteString fromBase64(String base64) {
+ try {
+ base64 = FROM_BASE64_REGEXP.matcher(base64).replaceAll("");
Review comment:
Just wondering: could you please explain why
`java.util.Base64#getMimeDecoder` does not work here?
It looks like `java.util.Base64#getMimeDecoder` is just enough, and it does
not require regexp preprocessing
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