What the engine said of a Filter by Expression's condition, for one input
schema and one lambda, told apart by their signature
(getExpressionFilterSignature): nothing yet; checked, one Boolean of a
row; or why not, with the condition's type when it types but isn't one
Boolean (resultType, as Integer[1]).
upstream is what the host that checked it gave the engine for the input,
digested, as an Extend's typing records it (PLAN §11.7, §11.11): a host
compares it and checks again when it differs. Cube never reads it, and
doesn't save it: a loaded cube is checked again.
What the engine said of a Filter by Expression's condition, for one input schema and one lambda, told apart by their signature (
getExpressionFilterSignature): nothing yet; checked, one Boolean of a row; or why not, with the condition's type when it types but isn't one Boolean (resultType, asInteger[1]).upstreamis what the host that checked it gave the engine for the input, digested, as an Extend's typing records it (PLAN §11.7, §11.11): a host compares it and checks again when it differs. Cube never reads it, and doesn't save it: a loaded cube is checked again.