Add multiIf

src/Functions/multiIf.cpp

@@ -39,6 +39,7 @@ public:
     bool isVariadic() const override { return true; }
     size_t getNumberOfArguments() const override { return 0; }
     bool useDefaultImplementationForNulls() const override { return false; }
+
     ColumnNumbers getArgumentsThatDontImplyNullableReturnType(size_t number_of_arguments) const override
     {
         ColumnNumbers args;
@@ -70,7 +71,6 @@ public:
             throw Exception{"Invalid number of arguments for function " + getName(),
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
 
-
         for_conditions([&](const DataTypePtr & arg)
         {
             const IDataType * nested_type;

tests/queries/0_stateless/01355_if_fixed_string.reference

@@ -18,3 +18,23 @@
 7\0	FixedString(2)
 -8	FixedString(2)
 9\0	FixedString(2)
+0	String
+1	String
+-2	String
+3	String
+-4	String
+5	String
+-6	String
+7	String
+-8	String
+9	String
+0\0	FixedString(2)
+1\0	FixedString(2)
+-2	FixedString(2)
+3\0	FixedString(2)
+-4	FixedString(2)
+5\0	FixedString(2)
+-6	FixedString(2)
+7\0	FixedString(2)
+-8	FixedString(2)
+9\0	FixedString(2)

tests/queries/0_stateless/01355_if_fixed_string.sql

@@ -1,2 +1,5 @@
 SELECT if(number % 2, toFixedString(toString(number), 2), toFixedString(toString(-number), 5)) AS x, toTypeName(x) FROM system.numbers LIMIT 10;
 SELECT if(number % 2, toFixedString(toString(number), 2), toFixedString(toString(-number), 2)) AS x, toTypeName(x) FROM system.numbers LIMIT 10;
+
+SELECT multiIf(number % 2, toFixedString(toString(number), 2), toFixedString(toString(-number), 5)) AS x, toTypeName(x) FROM system.numbers LIMIT 10;
+SELECT multiIf(number % 2, toFixedString(toString(number), 2), toFixedString(toString(-number), 2)) AS x, toTypeName(x) FROM system.numbers LIMIT 10;