R/CHR.R

In nonsleepr/teradataR: Teradata R Package

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

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