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From Jacques Nadeau <jacq...@apache.org>
Subject Re: Accessing QueryContext inside a StoragePluginOptimizerRule
Date Thu, 30 Apr 2015 06:14:23 GMT
PlannerSettings is the primary we expose settings that need to be
interrogated during planning (e.g. in an optimizer rule).  You can get
ahold of this by doing:

PlannerSettings settings = PrelUtil.getPlannerSettings(call.getPlanner());

PlannerSettings then has access to session settings.

You can see an example of this at [1]

I'm excited to see the impact of this.  Look forward to seeing the patch!


On Wed, Apr 29, 2015 at 11:06 PM, Adam Gilmore <dragoncurve@gmail.com>

> Hi guys,
> I'm trying to work out how I could access the QueryContext inside
> a StoragePluginOptimizerRule.
> I've basically implemented the Parquet pushdown filtering, but I really
> need to access the session settings (for whether or not we're using the new
> Parquet reader so we can completely pushdown a filter and also for
> providing a setting to enable/disable pushdown filters).
> I've looked in a fair bit of detail, but there doesn't seem to be a way to
> access this.
> If this is not the way I should be implementing it, can anyone make some
> suggestions?  I really want to do full pushdown when using the new Parquet
> reader, but I have no easy way to detect it's going to be used.
> P.S. In cases where we "fall back" to the new Parquet reader, I don't do a
> full pushdown (as detecting that is done further down than the planner).
> This could be fixed in the future, but for now I'm happy for just when that
> setting is true.

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