Function isAggregateExpression

packages/db/src/query/compiler/select.ts:253–257

* Helper function to check if an expression is an aggregate

(
  expr: BasicExpression | Aggregate,
)

 * Helper function to check if an expression is an aggregate
 */
function isAggregateExpression(
  expr: BasicExpression | Aggregate,
): expr is Aggregate {
  return expr.type === `agg`
}

/**
 * Processes a single argument in a function context