JIRA: https://issues.apache.org/jira/browse/SPARK-13658

## What changes were proposed in this pull request?

Quoted from JIRA description: When run TPCDS Q3 [1] with lots predicates to filter out the partitions, the optimizer rule BooleanSimplification take about 2 seconds (it use lots of sematicsEqual, which require copy the whole tree).

It will great if we could speedup it.

[1] https://github.com/cloudera/impala-tpcds-kit/blob/master/queries/q3.sql

How to speed up it:

When we ask the canonicalized expression in `Expression`, it calls `Canonicalize.execute` on itself. `Canonicalize.execute` basically transforms up all expressions included in this expression. However, we don't keep the canonicalized versions for these children expressions. So in next time we ask the canonicalized expressions for the children expressions (e.g., `BooleanSimplification`), we will rerun `Canonicalize.execute` on each of them. It wastes much time.

By forcing the children expressions to get and keep their canonicalized versions first, we can avoid re-canonicalize these expressions.

I simply benchmark it with an expression which is part of the where clause in TPCDS Q3:

    val testRelation = LocalRelation('ss_sold_date_sk.int, 'd_moy.int, 'i_manufact_id.int, 'ss_item_sk.string, 'i_item_sk.string, 'd_date_sk.int)

    val input = ('d_date_sk === 'ss_sold_date_sk) && ('ss_item_sk === 'i_item_sk) && ('i_manufact_id === 436) && ('d_moy === 12) && (('ss_sold_date_sk > 2415355 && 'ss_sold_date_sk < 2415385) || ('ss_sold_date_sk > 2415720 && 'ss_sold_date_sk < 2415750) || ('ss_sold_date_sk > 2416085 && 'ss_sold_date_sk < 2416115) || ('ss_sold_date_sk > 2416450 && 'ss_sold_date_sk < 2416480) || ('ss_sold_date_sk > 2416816 && 'ss_sold_date_sk < 2416846) || ('ss_sold_date_sk > 2417181 && 'ss_sold_date_sk < 2417211) || ('ss_sold_date_sk > 2417546 && 'ss_sold_date_sk < 2417576) || ('ss_sold_date_sk > 2417911 && 'ss_sold_date_sk < 2417941) || ('ss_sold_date_sk > 2418277 && 'ss_sold_date_sk < 2418307) || ('ss_sold_date_sk > 2418642 && 'ss_sold_date_sk < 2418672) || ('ss_sold_date_sk > 2419007 && 'ss_sold_date_sk < 2419037) || ('ss_sold_date_sk > 2419372 && 'ss_sold_date_sk < 2419402) || ('ss_sold_date_sk > 2419738 && 'ss_sold_date_sk < 2419768) || ('ss_sold_date_sk > 2420103 && 'ss_sold_date_sk < 2420133) || ('ss_sold_date_sk > 2420468 && 'ss_sold_date_sk < 2420498) || ('ss_sold_date_sk > 2420833 && 'ss_sold_date_sk < 2420863) || ('ss_sold_date_sk > 2421199 && 'ss_sold_date_sk < 2421229) || ('ss_sold_date_sk > 2421564 && 'ss_sold_date_sk < 2421594) || ('ss_sold_date_sk > 2421929 && 'ss_sold_date_sk < 2421959) || ('ss_sold_date_sk > 2422294 && 'ss_sold_date_sk < 2422324) || ('ss_sold_date_sk > 2422660 && 'ss_sold_date_sk < 2422690) || ('ss_sold_date_sk > 2423025 && 'ss_sold_date_sk < 2423055) || ('ss_sold_date_sk > 2423390 && 'ss_sold_date_sk < 2423420) || ('ss_sold_date_sk > 2423755 && 'ss_sold_date_sk < 2423785) || ('ss_sold_date_sk > 2424121 && 'ss_sold_date_sk < 2424151) || ('ss_sold_date_sk > 2424486 && 'ss_sold_date_sk < 2424516) || ('ss_sold_date_sk > 2424851 && 'ss_sold_date_sk < 2424881) || ('ss_sold_date_sk > 2425216 && 'ss_sold_date_sk < 2425246) || ('ss_sold_date_sk > 2425582 && 'ss_sold_date_sk < 2425612) || ('ss_sold_date_sk > 2425947 && 'ss_sold_date_sk < 2425977) || ('ss_sold_date_sk > 2426312 && 'ss_sold_date_sk < 2426342) || ('ss_sold_date_sk > 2426677 && 'ss_sold_date_sk < 2426707) || ('ss_sold_date_sk > 2427043 && 'ss_sold_date_sk < 2427073) || ('ss_sold_date_sk > 2427408 && 'ss_sold_date_sk < 2427438) || ('ss_sold_date_sk > 2427773 && 'ss_sold_date_sk < 2427803) || ('ss_sold_date_sk > 2428138 && 'ss_sold_date_sk < 2428168) || ('ss_sold_date_sk > 2428504 && 'ss_sold_date_sk < 2428534) || ('ss_sold_date_sk > 2428869 && 'ss_sold_date_sk < 2428899) || ('ss_sold_date_sk > 2429234 && 'ss_sold_date_sk < 2429264) || ('ss_sold_date_sk > 2429599 && 'ss_sold_date_sk < 2429629) || ('ss_sold_date_sk > 2429965 && 'ss_sold_date_sk < 2429995) || ('ss_sold_date_sk > 2430330 && 'ss_sold_date_sk < 2430360) || ('ss_sold_date_sk > 2430695 && 'ss_sold_date_sk < 2430725) || ('ss_sold_date_sk > 2431060 && 'ss_sold_date_sk < 2431090) || ('ss_sold_date_sk > 2431426 && 'ss_sold_date_sk < 2431456) || ('ss_sold_date_sk > 2431791 && 'ss_sold_date_sk < 2431821) || ('ss_sold_date_sk > 2432156 && 'ss_sold_date_sk < 2432186) || ('ss_sold_date_sk > 2432521 && 'ss_sold_date_sk < 2432551) || ('ss_sold_date_sk > 2432887 && 'ss_sold_date_sk < 2432917) || ('ss_sold_date_sk > 2433252 && 'ss_sold_date_sk < 2433282) || ('ss_sold_date_sk > 2433617 && 'ss_sold_date_sk < 2433647) || ('ss_sold_date_sk > 2433982 && 'ss_sold_date_sk < 2434012) || ('ss_sold_date_sk > 2434348 && 'ss_sold_date_sk < 2434378) || ('ss_sold_date_sk > 2434713 && 'ss_sold_date_sk < 2434743)))

    val plan = testRelation.where(input).analyze
    val actual = Optimize.execute(plan)

With this patch:

    352 milliseconds
    346 milliseconds
    340 milliseconds

Without this patch:

    585 milliseconds
    880 milliseconds
    677 milliseconds

## How was this patch tested?

Existing tests should pass.

Author: Liang-Chi Hsieh <simonh@tw.ibm.com>
Author: Liang-Chi Hsieh <viirya@gmail.com>

Closes #11647 from viirya/improve-expr-canonicalize.