**Describe the unexpected behaviour**

Not sure if it is a bug but we encounter a very strange issue when using the same field 2 times in a where clause.
Basically : field = <> and toYear(field)= <>

**How to reproduce**
* Clickhouse 20.5.2.7


Create table statement :
```
DROP TABLE IF EXISTS datasources.cal_pace_strange2;
CREATE TABLE datasources.cal_pace_strange2
(
    `htl_id` UInt32,
    `stay_date` Date,
    `snpdate` Date,
    `leadtime` String,
    `los` String,
    `mkt_id` String,
    `sob_id` String,
    `res_status_id` String,
    `rt_id` String,
    `cur` String,
    `rns` Decimal(9, 4),
    `arrivals` Decimal(9, 4),
    `departures` Decimal(9, 4),
    `adults` Decimal(9, 4),
    `children` Decimal(9, 4),
    `rm_rev` Decimal(18, 10),
    `fd_rev` Decimal(18, 10),
    `oth_rev` Decimal(18, 10),
    `tot_rev` Decimal(18, 10)

)
    ENGINE = MergeTree()
        PARTITION BY toYYYYMM(snpdate)
        ORDER BY (htl_id, stay_date, snpdate)
        SETTINGS index_granularity = 8192;
```

Load the data using the attached SQL inserts.

[data_bug_clickhouse.txt](https://github.com/ClickHouse/ClickHouse/files/4903808/data_bug_clickhouse.txt)


This query returns 0 results :

`select * from cal_pace_strange2 where snpdate='2020-06-09' and htl_id=66 and stay_date='2020-10-02' and toYear(stay_date) = 2020;`

This one return the correct results :

`select * from cal_pace_strange2 where snpdate='2020-06-09' and htl_id=66 and stay_date='2020-10-02'`

Same behavior occurs in 20.4.3 and 20.4.4

Expected behavior :

Both queries should return the same results.




const SelectQueryInfo & query_info,
    const Context & context,
    const Names & key_column_names,
    const ExpressionActionsPtr & key_expr_)
    : key_expr(key_expr_), prepared_sets(query_info.sets)
{
    for (size_t i = 0, size = key_column_names.size(); i < size; ++i)
    {
        std::string name = key_column_names[i];
        if (!key_columns.count(name))
            key_columns[name] = i;
    }
    /** Evaluation of expressions that depend only on constants.
      * For the index to be used, if it is written, for example `WHERE Date = toDate(now())`.
      */
    Block block_with_constants = getBlockWithConstants(query_info.query, query_info.syntax_analyzer_result, context);
    const ASTSelectQuery & select = query_info.query->as<ASTSelectQuery &>();
    if (select.where() || select.prewhere())
    {
        ASTPtr filter_query;