CASE When: result type should be coercible to a common type

[liukun4515]

Describe the bug

❯ select case when 1=1 then true else 1 end;
+--------------------------------------------------------------------+
| CASE WHEN Int64(1) = Int64(1) THEN Boolean(true) ELSE Int64(1) END |
+--------------------------------------------------------------------+
| true                                                               |
+--------------------------------------------------------------------+
1 row in set. Query took 0.042 seconds.
❯ explain select case when 1=1 then true else 1 end;
+---------------+---------------------------------------------------------------------------------------------------+
| plan_type     | plan                                                                                              |
+---------------+---------------------------------------------------------------------------------------------------+
| logical_plan  | Projection: Boolean(true) AS CASE WHEN Int64(1) = Int64(1) THEN Boolean(true) ELSE Int64(1) END   |
|               |   EmptyRelation                                                                                   |
| physical_plan | ProjectionExec: expr=[true as CASE WHEN Int64(1) = Int64(1) THEN Boolean(true) ELSE Int64(1) END] |
|               |   EmptyExec: produce_one_row=true                                                                 |
|               |                                                                                                   |
+---------------+---------------------------------------------------------------------------------------------------+
2 rows in set. Query took 0.003 seconds.
❯ explain select case when 1>1 then true else 1 end;
+---------------+---------------------------------------------------------------------------------------------------+
| plan_type     | plan                                                                                              |
+---------------+---------------------------------------------------------------------------------------------------+
| logical_plan  | Projection: Boolean(true) AS CASE WHEN Int64(1) > Int64(1) THEN Boolean(true) ELSE Int64(1) END   |
|               |   EmptyRelation                                                                                   |
| physical_plan | ProjectionExec: expr=[true as CASE WHEN Int64(1) > Int64(1) THEN Boolean(true) ELSE Int64(1) END] |
|               |   EmptyExec: produce_one_row=true                                                                 |
|               |                                                                                                   |
+---------------+---------------------------------------------------------------------------------------------------+
2 rows in set. Query took 0.004 seconds.
❯  select case when 1>1 then true else 1 end;
+--------------------------------------------------------------------+
| CASE WHEN Int64(1) > Int64(1) THEN Boolean(true) ELSE Int64(1) END |
+--------------------------------------------------------------------+
| true                                                               |
+--------------------------------------------------------------------+

One case when sql has two diff result data type.

From other system, case when should have the common data type, but now the result type is the first non-null data type.

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Expected behavior
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Additional context
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[liukun4515]

I will fix this issue.