[jira] [Created] (IGNITE-6054) SQL: Add option to store primitive keys in plain form for CREATE TABLE

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-6054:
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             Summary: SQL: Add option to store primitive keys in plain form for CREATE TABLE
                 Key: IGNITE-6054
                 URL: https://issues.apache.org/jira/browse/IGNITE-6054
             Project: Ignite
          Issue Type: Bug
          Components: sql
    Affects Versions: 2.1
            Reporter: Vladimir Ozerov
             Fix For: 2.2


Currently we create separate internal type for primary key columns. This is necessary to avoid clashes between keys of the same type within the same caches (ironically, we do not allow multiple dynamic tables per cache).

The most widely used PK is single-column key of {{Long}} or {{String}} data type. If we store a key plain {{long}}, it will consume 9 bytes. If we store it as an object with long field, it will consume 24 + 9 = 33 bytes. What is worse, in the latter case we will have to copy key object back and forth between page memory and application code many times, while for plain long key we simply do {{Unsafe.getLong}}.

For this reason, it makes sense to introduce special mode for {{CREATE TABLE}} command, when key will not be wrapped into a class, and will be stored as is. Let's name it {{plainPrimaryKey}}.



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