func (eh *exprHelper) init(
expr Expression, types []sqlbase.ColumnType_Kind, evalCtx *parser.EvalContext,
) error {
if expr.Expr == "" {
return nil
}
eh.types = types
eh.evalCtx = evalCtx
eh.vars = parser.MakeIndexedVarHelper(eh, len(types))
var err error
eh.expr, err = processExpression(expr, &eh.vars)
if err != nil {
return err
}
var p parser.Parser
if p.AggregateInExpr(eh.expr, evalCtx.SearchPath) {
return errors.Errorf("expression '%s' has aggregate", eh.expr)
}
return nil
}
