Where clause not working with the ClickHouse view - view

Question

I am trying to create a view on a source table and then select the data for a specific timestamp range from the view and put it into the targe table.
We have a source table:
1 Million rows are pushed to the source table which corresponds to data from 1 January to 31 January.
CREATE TABLE IF NOT EXISTS source(
CELL String,
TIMESTAMP DateTime,
COUNTER1 Float32,
COUNTER2 Float32,
COUNTER3 Float32,
COUNTER4 Float32,
COUNTER5 Float32,
COUNTER6 Float32,
InsertionTime DateTime DEFAULT now(), /* Insertion Time */
QHour DateTime DEFAULT toStartOfFifteenMinutes(TIMESTAMP)
) ENGINE=ReplacingMergeTree()
PARTITION BY toYYYYMM(TIMESTAMP)
ORDER BY (QHour, TIMESTAMP, CELL)
SETTINGS index_granularity = 31768
Now, we created a view on the source table.
CREATE VIEW IF NOT EXISTS myView
AS SELECT
CELL,
QHour,
toStartOfFifteenMinutes(TIMESTAMP) AS ViewQHour,
100 * sum(COUNTER1) / sum(COUNTER2) AS KPI1
FROM (
SELECT
CELL,
TIMESTAMP,
any(QHour) as QHour
argMax(COUNTER1, InsertionTime) AS COUNTER1,
argMax(COUNTER2, InsertionTime) AS COUNTER2
FROM ThreeGCell
GROUP BY TIMESTAMP, CELL, QHour)
GROUP BY ViewQHour, CELL
ORDER BY ViewQHour, CELL
Now, on the view I need to select the data for a time period from view: 1 January to 10th January.
SELECT *
FROM myView
WHERE QHour >= toDateTime('2020-01-01 00:00:00') AND QHour <= toDateTime('2020-01-10 00:00:00')
But the select query on the view adds all 1 million rows to the target table which is whole January data while I am looking for data for specific period only 1 January to 10th January.
I have following questions:
Can we modify the query on the view to only process the specific time period?
Can we generate a view on the latest dataset pushed in the source table on the fly?
I mean we have only the filtered dataset from source table and use the filtered data in the view?
Can such filters be modified to use different time ranges?
For example, we have data from 1 January to 10th January in the view.
Then in second run, we have data from 11th Janury to 20th January in the view.

Answer 1

CREATE VIEW IF NOT EXISTS myView
....
ORDER BY ViewQHour, CELL
Most of databases forbid to create view with ORDER BY unfortunately CH does not. It was a mistake in initial design to allow to create such views.
ORDER BY cancels predicate pushdown because it corrupts results in some cases (optimizer still is very weak and does't understand cases with runningDiff() and neighbour().
https://github.com/ClickHouse/ClickHouse/issues/9425#issuecomment-592658368