Allow casting query functions as well

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/DB/QueryBuilder/ExpressionBuilder/ExpressionBuilder.php

@@ -425,11 +425,11 @@ class ExpressionBuilder implements IExpressionBuilder {
 	/**
 	 * Returns a IQueryFunction that casts the column to the given type
 	 *
-	 * @param string $column
+	 * @param string|IQueryFunction $column
 	 * @param mixed $type One of IQueryBuilder::PARAM_*
 	 * @return IQueryFunction
 	 */
-	public function castColumn(string $column, $type): IQueryFunction {
+	public function castColumn($column, $type): IQueryFunction {
 		return new QueryFunction(
 			$this->helper->quoteColumnName($column)
 		);

lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php

@@ -161,11 +161,11 @@ class OCIExpressionBuilder extends ExpressionBuilder {
 	/**
 	 * Returns a IQueryFunction that casts the column to the given type
 	 *
-	 * @param string $column
+	 * @param string|IQueryFunction $column
 	 * @param mixed $type One of IQueryBuilder::PARAM_*
 	 * @return IQueryFunction
 	 */
-	public function castColumn(string $column, $type): IQueryFunction {
+	public function castColumn($column, $type): IQueryFunction {
 		if ($type === IQueryBuilder::PARAM_STR) {
 			$column = $this->helper->quoteColumnName($column);
 			return new QueryFunction('to_char(' . $column . ')');

lib/private/DB/QueryBuilder/ExpressionBuilder/PgSqlExpressionBuilder.php

@@ -33,7 +33,7 @@ class PgSqlExpressionBuilder extends ExpressionBuilder {
 	/**
 	 * Returns a IQueryFunction that casts the column to the given type
 	 *
-	 * @param string $column
+	 * @param string|IQueryFunction $column
 	 * @param mixed $type One of IQueryBuilder::PARAM_*
 	 * @return IQueryFunction
 	 */

lib/public/DB/QueryBuilder/IExpressionBuilder.php

@@ -431,7 +431,7 @@ interface IExpressionBuilder {
 	/**
 	 * Returns a IQueryFunction that casts the column to the given type
 	 *
-	 * @param string $column
+	 * @param string|IQueryFunction $column
 	 * @param mixed $type One of IQueryBuilder::PARAM_*
 	 * @return IQueryFunction
 	 * @since 9.0.0
@@ -439,5 +439,5 @@ interface IExpressionBuilder {
 	 * @psalm-taint-sink sql $column
 	 * @psalm-taint-sink sql $type
 	 */
-	public function castColumn(string $column, $type): IQueryFunction;
+	public function castColumn($column, $type): IQueryFunction;
 }