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add a message for precondition #11

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add a message for precondition #11

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2 changes: 1 addition & 1 deletion Sources/ClickHouseVapor/ClickHouseColumnConvertible.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -204,7 +204,7 @@ public extension Field where Value == ClickHouseEnum16 {
extension Array {
/// Only include column rows where the isIncluded array is true
func filtered(_ isIncluded: [Bool]) -> Self {
precondition(count == isIncluded.count)
precondition(count == isIncluded.count, "Filtering model not possible, expected count \(count) but got \(isIncluded.count)")
var arr = Self()
let count = isIncluded.reduce(0, { $0 + ($1 ? 1 : 0) })
arr.reserveCapacity(count)
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