Clean up SQL time interval math expressions #796
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The original implementation of SqlTimeDeltaExpression had a custom override for grain_to_date intended to support cumulative metrics. This parameter would change the expression from a time delta to a date_trunc. At some point we cleaned up the callsites to invoke date_trunc directly instead of offloading this work to an overloaded class. This commit simply removes the confusing parameter in order to streamline the expression rendering for time delta operations.
The original name for this class was misleading, as a time delta is effectively an interval computed as a difference. This suggested either that the rendering should be a date_diff to produce an interval between two timestamps, or that it should be an interval expression for use in some other operation. In reality, this class provides the functionality of a date_subtract, where we subtract an interval value from a given input timestamp.
We had a couple of copy/paste issues with sql expression nodes identifying themselves as IS_NULL expressions. This tidies that up.
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plypaul
approved these changes
Oct 5, 2023
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Our time interval math expressions were originally represented in a class called
SqlTimeDeltaExpression. There were two issues with this:
from an input time value.
it's behavior from rendering an interval subtraction to rendering date_trunc
This PR addresses both of these, and improves some of the documentation and class
labeling properties as part of these updates.