Function typesEqualUpToNullability

src/Interpreters/JoinUtils.cpp:476–481

}

bool typesEqualUpToNullability(DataTypePtr left_type, DataTypePtr right_type)
{
    DataTypePtr left_type_strict = removeNullable(removeLowCardinality(left_type));
    DataTypePtr right_type_strict = removeNullable(removeLowCardinality(right_type));
    return left_type_strict->equals(*right_type_strict);
}

static ColumnPtr castToBoolColumn(ColumnPtr column)
{