title: Is it possible to assign distributed column values to specific Postgres-XL nodes?
body: <p>We would like to be able to use distributed tables where some nodes would have multiple tenants and other nodes may only have one or two (e.g. put a massive, high-traffic tenant by themselves, but group multiple small tenants together). </p>
  
  <p>I see DISTRIBUTE BY options of HASH and MODULO, which I don't think fit this requirement. There are other CREATE TABLE options (specifically DISTRIBUTED and DISTSTYLE, shown below), but I can't seem to find documentation or details as to what these options mean. I saw a post referring to a custom distribution function, but I can't find any other references to it.</p>
  
  <p>Questions:
  Is there a way to explicitly assign distribution column values to nodes using DISTRIBUTED or DISTSTYLE options or by other means?
  Are custom distribution functions available or on the roadmap?
  (Bonus question: Any links to details about DISTRIBUTED or DISTSTYLE?)</p>
  
  <pre><code>...
  [ 
    DISTRIBUTE BY { REPLICATION | ROUNDROBIN | { [HASH | MODULO ] ( column_name ) } } |
    DISTRIBUTED { { BY ( column_name ) } | { RANDOMLY } |
    DISTSTYLE { EVEN | KEY | ALL } DISTKEY ( column_name )
  ]
  </code></pre>