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_r296329172
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File path: core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java
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@@ -123,6 +126,48 @@
private SqlFunctions() {
}
+ /** SQL TO_BASE64(string) function. */
+ public static String toBase64(String string) {
+ String base64 = Base64.getEncoder().encodeToString(string.getBytes(UTF_8));
+ StringBuilder str = new StringBuilder(base64.length() + base64.length() /
76);
+ int i;
+ if (base64.length() > 76) {
+ for (i = 0; i + 76 < base64.length(); i += 76) {
+ str.append(base64, i, i + 76);
+ str.append("\n");
+ }
+ str.append(base64, i, base64.length());
+ return str.toString();
+ }
+ return base64;
+ }
+
+ /** SQL TO_BASE64(string) function for binary string. */
+ public static String toBase64(ByteString string) {
+ String base64 = Base64.getEncoder().encodeToString(string.getBytes());
+ StringBuilder str = new StringBuilder(base64.length() + base64.length() /
76);
+ int i;
+ if (base64.length() > 76) {
+ for (i = 0; i + 76 < base64.length(); i += 76) {
+ str.append(base64, i, i + 76);
+ str.append("\n");
+ }
+ str.append(base64, i, base64.length());
Review comment:
Does this work for empty string?
Can you please add a test with `to_base64('')` ?
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