 | VirtualDataWindowGetLookup Method |
Returns the lookup strategy for use by an EPL statement to obtain data.
This method is invoked one or more times at the time an EPL statement is created that
performs a subquery, join, on-action or fire-and-forget query against the virtual data window.
The lookup strategy returned is used when the EPL statement for which it was created performs
a read-operation against the managed data. Multiple lookup strategies for the same EPL statement
are possible for join statements.
The context object passed in is derived from an analysis of the where-clause and lists the
unique property names of the event type that are index fields, i.e. fields against which the
lookup occurs.
The order of hash and btree properties provided by the context matches the order that lookup
values are provided to the lookup strategy.
Namespace:
com.espertech.esper.common.client.hook.vdw
Assembly:
NEsper.Common (in NEsper.Common.dll) Version: 8.0.0.0
Syntax
See Also