Add group_concat aggregator function

Signed-off-by: Vitor Mattos <vitor@php.rio>

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/public/DB/QueryBuilder/IFunctionBuilder.php b/lib/public/DB/QueryBuilder/IFunctionBuilder.php
index 33d0fbe3b1a..e04a4cbfdba 100644
--- a/lib/public/DB/QueryBuilder/IFunctionBuilder.php
+++ b/lib/public/DB/QueryBuilder/IFunctionBuilder.php
@@ -52,6 +52,22 @@ interface IFunctionBuilder {
 	public function concat($x, $y): IQueryFunction;
 
 	/**
+	 * Returns a string which is the concatenation of all non-NULL values of X
+	 *
+	 * Usage examples:
+	 *
+	 * groupConcat('column') -- with comma as separator (default separator)
+	 *
+	 * groupConcat('column', ';') -- with different separator
+	 *
+	 * @param string|ILiteral|IParameter|IQueryFunction $expr The expression to group
+	 * @param string|null $separator The separator
+	 * @return IQueryFunction
+	 * @since 24.0.0
+	 */
+	public function groupConcat($expr, ?string $separator = ','): IQueryFunction;
+
+	/**
 	 * Takes a substring from the input string
 	 *
 	 * @param string|ILiteral|IParameter|IQueryFunction $input The input string