R/LENGTH.R

In nonsleepr/teradataR: Teradata R Package

LENGTH <- function(x) {
    if (inherits(x, "td.data.frame")) {
        if (length(x) > 1) 
            message("LENGTH warning:  td.data.frame 'x' has length > 1 using first element")
        
        val <- paste("LENGTH(", .td.gencolumnexpr(x[1]), ")", sep = "")
    } else if (inherits(x, "td.expression") || inherits(x, "numeric")) 
        val <- paste("LENGTH(", x, ")", sep = "") else if (inherits(x, "character")) 
        val <- paste("LENGTH('", x, "')", sep = "") else stop("Invalid data type for 'x' in LENGTH function")
    
    class(val) <- "td.expression"
    return(val)
}

# LENGTH <- function(x) { asTdExpr <- function(x) {class(x) <- 'td.expression'; return(x)} if(inherits(x,
# 'td.data.frame')) { if(length(x) == 1) if(!is.null(attr(x, 'expressions'))) return(asTdExpr(paste('LENGTH(', attr(x,
# 'expressions')[[names(x)]], ')', sep=''))) else return(asTdExpr(paste('LENGTH(\'', names(x), '\')', sep=''))) else
# { message('LENGTH warning: td.data.frame 'x' has length > 1 using first element') return(asTdExpr(paste('LENGTH(\'',
# names(x)[1], '\')', sep=''))) } } if(inherits(x, 'character') || inherits(x,'td.expression')) {
# return(asTdExpr(paste('LENGTH(', x, ')', sep=''))) } }