Changeset: a7c663de357a for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=a7c663de357a
Added Files:
clients/R/MonetDB.R/R/dbapply.R
clients/R/MonetDB.R/man/dbApply.Rd
clients/R/Tests/dbapply.R
clients/R/Tests/dbapply.reqtests
clients/R/Tests/dbapply.stable.err
clients/R/Tests/dbapply.stable.out
sql/test/BugTracker-2015/Tests/epoch_now.Bug-3740.sql
sql/test/BugTracker-2015/Tests/epoch_now.Bug-3740.stable.err
sql/test/BugTracker-2015/Tests/epoch_now.Bug-3740.stable.out
sql/test/BugTracker-2015/Tests/mergejoin_NULL.Bug-3747.sql
sql/test/BugTracker-2015/Tests/mergejoin_NULL.Bug-3747.stable.err
sql/test/BugTracker-2015/Tests/mergejoin_NULL.Bug-3747.stable.out
sql/test/BugTracker-2015/Tests/null_is_null.Bug-3739.sql
sql/test/BugTracker-2015/Tests/null_is_null.Bug-3739.stable.err
sql/test/BugTracker-2015/Tests/null_is_null.Bug-3739.stable.out
sql/test/BugTracker-2015/Tests/savepoint.Bug-3738-1.sql
sql/test/BugTracker-2015/Tests/savepoint.Bug-3738-1.stable.err
sql/test/BugTracker-2015/Tests/savepoint.Bug-3738-1.stable.out
sql/test/BugTracker-2015/Tests/savepoint.Bug-3738-2.sql
sql/test/BugTracker-2015/Tests/savepoint.Bug-3738-2.stable.err
sql/test/BugTracker-2015/Tests/savepoint.Bug-3738-2.stable.out
Modified Files:
clients/R/MonetDB.R/DESCRIPTION
clients/R/MonetDB.R/NAMESPACE
clients/R/MonetDB.R/NEWS
clients/R/MonetDB.R/R/control.R
clients/R/MonetDB.R/R/dbi.R
clients/R/MonetDB.R/R/dplyr.R
clients/R/Tests/All
clients/R/Tests/dbi.R
clients/R/Tests/dbi.stable.err
clients/R/Tests/dbi.stable.out
clients/R/Tests/dplyr.R
clients/R/Tests/dplyr.stable.out
clients/Tests/SQL-dump.stable.out
clients/Tests/SQL-dump.stable.out.int128
clients/nodejs/monetdb/mapiclient.js
clients/nodejs/monetdb/package.json
clients/odbc/driver/SQLTables.c
gdk/gdk_bbp.c
gdk/gdk_join.c
gdk/gdk_search.c
gdk/gdk_select.c
geom/monetdb5/geom.c
java/build.xml
java/src/nl/cwi/monetdb/jdbc/MonetDatabaseMetaData.java
monetdb5/extras/rapi/Tests/rapi01.stable.err
monetdb5/extras/rapi/rapi.c
monetdb5/modules/kernel/algebra.c
monetdb5/tests/gdkTests/Tests/selecttst.stable.out
sql/backends/monet5/Tests/rapi09.stable.err
sql/backends/monet5/generator/generator.c
sql/backends/monet5/rel_bin.c
sql/backends/monet5/sql_gencode.c
sql/backends/monet5/sql_upgrades.c
sql/benchmarks/ssbm/Tests/01-explain.stable.out
sql/benchmarks/ssbm/Tests/01-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/02-explain.stable.out
sql/benchmarks/ssbm/Tests/02-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/03-explain.stable.out
sql/benchmarks/ssbm/Tests/03-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/04-explain.stable.out
sql/benchmarks/ssbm/Tests/04-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/05-explain.stable.out
sql/benchmarks/ssbm/Tests/05-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/06-explain.stable.out
sql/benchmarks/ssbm/Tests/06-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/07-explain.stable.out
sql/benchmarks/ssbm/Tests/07-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/08-explain.stable.out
sql/benchmarks/ssbm/Tests/08-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/09-explain.stable.out
sql/benchmarks/ssbm/Tests/09-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/10-explain.stable.out
sql/benchmarks/ssbm/Tests/10-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/11-explain.stable.out
sql/benchmarks/ssbm/Tests/11-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/12-explain.stable.out
sql/benchmarks/ssbm/Tests/12-explain.stable.out.int128
sql/benchmarks/ssbm/Tests/13-explain.stable.out
sql/benchmarks/ssbm/Tests/13-explain.stable.out.int128
sql/benchmarks/tpch/Tests/02-explain.stable.out
sql/benchmarks/tpch/Tests/03-explain.stable.out
sql/benchmarks/tpch/Tests/03-explain.stable.out.int128
sql/benchmarks/tpch/Tests/05-explain.stable.out
sql/benchmarks/tpch/Tests/05-explain.stable.out.32bit
sql/benchmarks/tpch/Tests/05-explain.stable.out.int128
sql/benchmarks/tpch/Tests/07-explain.stable.out
sql/benchmarks/tpch/Tests/07-explain.stable.out.int128
sql/benchmarks/tpch/Tests/08-explain.stable.out
sql/benchmarks/tpch/Tests/08-explain.stable.out.int128
sql/benchmarks/tpch/Tests/10-explain.stable.out
sql/benchmarks/tpch/Tests/10-explain.stable.out.int128
sql/benchmarks/tpch/Tests/11-explain.stable.out
sql/benchmarks/tpch/Tests/11-explain.stable.out.int128
sql/benchmarks/tpch/Tests/12-explain.stable.out
sql/benchmarks/tpch/Tests/12-explain.stable.out.int128
sql/benchmarks/tpch/Tests/16-explain.stable.out
sql/benchmarks/tpch/Tests/16-explain.stable.out.32bit
sql/benchmarks/tpch/Tests/17-explain.stable.out.int128
sql/benchmarks/tpch/Tests/19-explain.stable.out
sql/benchmarks/tpch/Tests/19-explain.stable.out.int128
sql/benchmarks/tpch/Tests/20-explain.stable.out
sql/benchmarks/tpch/Tests/20-explain.stable.out.32bit
sql/benchmarks/tpch/Tests/20-explain.stable.out.int128
sql/benchmarks/tpch/Tests/21-explain.stable.out
sql/benchmarks/tpch/Tests/21-explain.stable.out.32bit
sql/benchmarks/tpch/Tests/22-explain.stable.out
sql/benchmarks/tpch/Tests/22-explain.stable.out.32bit
sql/benchmarks/tpch/Tests/22-explain.stable.out.int128
sql/jdbc/tests/Tests/Test_Dobjects.stable.out
sql/scripts/17_temporal.sql
sql/server/rel_optimizer.c
sql/server/rel_select.c
sql/server/sql_mvc.c
sql/storage/bat/bat_storage.c
sql/storage/bat/bat_table.c
sql/storage/bat/bat_utils.c
sql/storage/store.c
sql/test/BugDay_2005-10-06_2.9.3/Tests/max_min_sum_null.SF-1123132.sql
sql/test/BugDay_2005-11-09_2.8/Tests/ORDER_BY_evaluation_error.SF-1023658.stable.out
sql/test/BugDay_2005-12-19_2.9.3/Tests/weird_reponse_on_limit.SF-1314643.stable.out
sql/test/BugTracker-2009/Tests/explain_gives_crash.SF-2741829.stable.out
sql/test/BugTracker-2009/Tests/join_topn.SF-2654133.stable.out
sql/test/BugTracker-2010/Tests/offset_limited_32bit.SF-2950579.stable.out
sql/test/BugTracker-2010/Tests/offset_limited_32bit.SF-2950579.stable.out.oid32
sql/test/BugTracker-2011/Tests/sqltables.Bug-2921.sql
sql/test/BugTracker-2011/Tests/sqltables.Bug-2921.stable.out
sql/test/BugTracker-2012/Tests/rewrite_like_into_likesubselect.Bug-3179.stable.out
sql/test/BugTracker-2013/Tests/swapped_likejoin.Bug-3375.stable.out
sql/test/BugTracker-2014/Tests/too_general_errmsg.Bug-3605.stable.err
sql/test/BugTracker-2015/Tests/All
sql/test/BugTracker/Tests/explain.SF-1739353.stable.out
sql/test/BugTracker/Tests/jdbc_no_debug.SF-1739356.stable.out
sql/test/BugTracker/Tests/jdbc_no_debug.SF-1739356.stable.out.32bit
sql/test/BugTracker/Tests/like_exp.SF-1613949.stable.out
sql/test/Dependencies/Tests/Dependencies.stable.out
sql/test/Dependencies/Tests/Dependencies.stable.out.int128
sql/test/Dependencies/dependency_DBobjects.sql
sql/test/Tests/systemfunctions.stable.out
sql/test/Tests/systemfunctions.stable.out.int128
sql/test/bugs/Tests/groupby_having-bug-sf-947600.stable.err
sql/test/bugs/Tests/groupby_having-bug-sf-947600.stable.out
sql/test/bugs/Tests/select_orderby_alias-bug-sf-1024615.stable.out
sql/test/bugs/Tests/subselect_ambigious_columns-bug-sf-949071.stable.out
sql/test/bugs/groupby_having-bug-sf-947600.sql
sql/test/bugs/subselect_ambigious_columns-bug-sf-949071.sql
sql/test/leaks/Tests/check1.stable.out.int128
sql/test/leaks/Tests/check2.stable.out.int128
sql/test/leaks/Tests/check3.stable.out.int128
sql/test/leaks/Tests/check4.stable.out.int128
sql/test/leaks/Tests/check5.stable.out.int128
sql/test/mapi/Tests/php_monetdb.stable.out
sql/test/testdb-upgrade-chain/Tests/upgrade.stable.out
sql/test/testdb-upgrade-chain/Tests/upgrade.stable.out.int128
sql/test/testdb-upgrade/Tests/upgrade.stable.out
sql/test/testdb-upgrade/Tests/upgrade.stable.out.int128
tools/merovingian/client/monetdb.c
tools/merovingian/daemon/client.c
tools/merovingian/daemon/merovingian.h
Branch: pyapi
Log Message:
Merge with default.
diffs (truncated from 12148 to 300 lines):
diff --git a/clients/R/MonetDB.R/DESCRIPTION b/clients/R/MonetDB.R/DESCRIPTION
--- a/clients/R/MonetDB.R/DESCRIPTION
+++ b/clients/R/MonetDB.R/DESCRIPTION
@@ -1,14 +1,16 @@
Package: MonetDB.R
-Version: 0.9.9
+Version: 0.9.8
Title: Connect MonetDB to R
Authors@R: c(person("Hannes Muehleisen", role = c("aut", "cre"),email =
"han...@cwi.nl"),
person("Thomas Lumley", role = "ctb"),
person("Anthony Damico", role = "ctb"))
Author: Hannes Muehleisen [aut, cre], Thomas Lumley [ctb], Anthony Damico [ctb]
Maintainer: Hannes Muehleisen <han...@cwi.nl>
-Depends: DBI (>= 0.3.1), digest (>= 0.6.4), methods, R (>= 3.1.1)
+Depends: DBI (>= 0.3.1)
+Imports: digest (>= 0.6.4), methods, codetools
Enhances: dplyr (>= 0.3.0)
Description: Allows to pull data from MonetDB into R. Includes a DBI
implementation and a dplyr backend.
License: MPL (== 1.1)
URL: http://monetr.r-forge.r-project.org
SystemRequirements: MonetDB, available from http://www.monetdb.org
+Collate: mapi.R dbi.R dbapply.R dplyr.R control.R
diff --git a/clients/R/MonetDB.R/NAMESPACE b/clients/R/MonetDB.R/NAMESPACE
--- a/clients/R/MonetDB.R/NAMESPACE
+++ b/clients/R/MonetDB.R/NAMESPACE
@@ -1,10 +1,10 @@
-import(DBI,digest,methods)
+import(DBI,digest,methods,codetools)
# export only driver constructor, everything else is DBI stuff..
export(MonetDB,MonetR,MonetDBR,MonetDB.R)
export(monet.read.csv,monetdb.read.csv)
# this one is not in the DBI
-exportMethods(dbSendUpdate,dbSendUpdateAsync,dbTransaction)
+exportMethods(dbSendUpdate,dbSendUpdateAsync,dbTransaction,mdbapply)
# shorthands
export(mc,mq)
useDynLib(MonetDB.R)
diff --git a/clients/R/MonetDB.R/NEWS b/clients/R/MonetDB.R/NEWS
--- a/clients/R/MonetDB.R/NEWS
+++ b/clients/R/MonetDB.R/NEWS
@@ -1,10 +1,10 @@
-0.9.9
-- dbWriteTable now quotes column names
-
0.9.8
- Added support for esoteric data types such as MONTH_INTERVAL (Thanks, Roman)
- Cleaned up SQL to R type mapping (we had this twice)
- Now creating actual R integers if data fits
+- dbWriteTable now quotes table/column names if necessary, and outputs
warnings if it did
+- New mdbapply function to automatically create and run embedded R functions
in MonetDB
+- Fixes for dplyr backend
0.9.7
- Fixed crash on Windows (Sorry, everyone)
diff --git a/clients/R/MonetDB.R/R/control.R b/clients/R/MonetDB.R/R/control.R
--- a/clients/R/MonetDB.R/R/control.R
+++ b/clients/R/MonetDB.R/R/control.R
@@ -5,7 +5,7 @@ monetdb.server.start <-
if( !file.exists( bat.file ) ) stop( paste( bat.file , "does not exist.
Run monetdb.server.setup() to create a batch file." ) )
# uugly, find path of pid file again by parsing shell script.
- sc <- read.table(bat.file,sep="\n",stringsAsFactors=F)
+ sc <- utils::read.table(bat.file,sep="\n",stringsAsFactors=F)
pidfile <- substring(sc[[2,1]],11)
# run script
diff --git a/clients/R/MonetDB.R/R/dbapply.R b/clients/R/MonetDB.R/R/dbapply.R
new file mode 100644
--- /dev/null
+++ b/clients/R/MonetDB.R/R/dbapply.R
@@ -0,0 +1,79 @@
+# TOOD: support running this on a select in addition to table?
+# TODO: support remote dbs, find out whether its local via canary file
+# TODO: don't actually construct the data frame but use attr/class trick to
save copying
+
+if (is.null(getGeneric("mdbapply"))) setGeneric("mdbapply", function(conn,
table, fun, ...)
+ standardGeneric("mdbapply"))
+
+setMethod("mdbapply", signature(conn="MonetDBConnection"), def=function(conn,
table, fun, ...) {
+ # make sure table exists
+ if (!dbExistsTable(conn, table)) {
+ stop("Table ", table, " does not exist.")
+ }
+
+ # generate unique function name
+ dbfunname <- "mdbapply_autogen_"
+ while (dbGetQuery(conn, paste0("select count(*) from functions where
name='", dbfunname, "'"))[[1]] > 0)
+ dbfunname <- paste0(dbfunname, sample(letters, 1))
+
+ # test R integration with dummy function
+ dbBegin(conn)
+ dbSendQuery(conn,paste0("CREATE FUNCTION ", dbfunname, "() RETURNS TABLE(d
INTEGER) LANGUAGE R {1L}"))
+ res <- dbGetQuery(conn,paste0("SELECT * FROM ", dbfunname, "()"))[[1]]
+ dbRollback(conn)
+
+ # now generate the UDF
+ # find packages loaded here and load them on the server as well
+ toloadpkgs <-
setdiff(unique(sapply(strsplit(grep("^package:",search(),value=T),":"),function(x)
x[[2]])),c("base","stats","methods","utils","codetools","graphics","grDevices","datasets","MonetDB.R","DBI","digest"))
+ dbrcode <- ''
+ if (length(toloadpkgs) > 0) {
+ if (getOption("monetdb.debug.query",FALSE))
+ message("Package(s) ",paste0(toloadpkgs,collapse=", "))
+ dbrcode <- paste0('# loading packages\ninvisible(lapply(setdiff(',
+ paste0(deparse(toloadpkgs),collapse=""),
+ ',unique(sapply(strsplit(grep("^package:", search(),
value=T),":"), function(x) x[[2]]))), function(pname) library(pname,
character.only=T, quietly=T)))\n')
+ }
+ # serialize global variables into ascii string, and add the code to scan it
again into the current env
+ vars <- codetools::findGlobals(fun, merge=F)$variables
+ mdbapply_dotdot <- list(...)
+ if (length(mdbapply_dotdot) > 0) {
+ vars <- c(vars,"mdbapply_dotdot")
+ assign("mdbapply_dotdot", mdbapply_dotdot, envir=environment(fun))
+ }
+ sfilename <- NA
+ if (length(vars) > 0) {
+ if (getOption("monetdb.debug.query",FALSE))
+ message("Variable(s) ",paste0(vars,collapse=", "))
+ sfilename <- tempfile()
+ save(list=vars,file=sfilename,envir=environment(fun), compress=T)
+ dbrcode <- paste0(dbrcode, '# load serialized global variable(s) ',
paste(vars, collapse=", "), '\nload("', sfilename, '")\n')
+ }
+
+ rfilename <- tempfile()
+ # get source of user function and append
+ dbrcode <- paste0(dbrcode, "# user-supplied function\nmdbapply_userfun <- ",
paste0(deparse(fun), collapse="\n"),
+ "\n# calling user function\nsaveRDS(do.call(mdbapply_userfun,
if(exists('mdbapply_dotdot')){c(list(mdbapply_dbdata), mdbapply_dotdot)}
else{list(mdbapply_dbdata)}),file=\"", rfilename, "\")\nreturn(42L)\n")
+
+ # find out things about the table, then wrap the R function
+ query <- paste0("SELECT * FROM ", table, " AS t")
+ res <- monetdb_queryinfo(conn, query)
+ dbfun <- paste0("CREATE FUNCTION ", dbfunname,"(",
paste0(dbQuoteIdentifier(conn, res$names)," ", res$dbtypes, collapse=", "),
+ ") \nRETURNS TABLE(retval INTEGER) LANGUAGE R {\n# rename
arguments\nmdbapply_dbdata <- data.frame(",
+ paste0(res$names, collapse=", "),", stringsAsFactors=F)\n",
dbrcode, "};\n")
+ # call the function we just created
+ dbsel <- paste0("SELECT * FROM ", dbfunname, "( (",query,") );\n")
+ # ok, talk to DB (easiest part of this)
+ res <- NA
+ dbBegin(conn)
+ tryCatch({
+ dbSendQuery(conn, dbfun)
+ dbGetQuery(conn, dbsel)
+ res <- readRDS(rfilename)
+ }, finally={
+ dbRollback(conn)
+ file.remove(stats::na.omit(c(sfilename, rfilename)))
+ })
+ res
+})
+
+
diff --git a/clients/R/MonetDB.R/R/dbi.R b/clients/R/MonetDB.R/R/dbi.R
--- a/clients/R/MonetDB.R/R/dbi.R
+++ b/clients/R/MonetDB.R/R/dbi.R
@@ -22,8 +22,8 @@ setMethod("dbUnloadDriver", "MonetDBDriv
setMethod("dbGetInfo", "MonetDBDriver", def=function(dbObj, ...)
list(name="MonetDBDriver",
- driver.version=packageVersion("MonetDB.R"),
- DBI.version=packageVersion("DBI"),
+ driver.version=utils::packageVersion("MonetDB.R"),
+ DBI.version=utils::packageVersion("DBI"),
client.version="NA",
max.connections=125) # R can only handle 128 connections, three of
which are pre-allocated
)
@@ -205,7 +205,7 @@ setMethod("dbListFields", "MonetDBConnec
setMethod("dbExistsTable", "MonetDBConnection", def=function(conn, name, ...) {
# TODO: this is evil...
return(tolower(gsub("(^\"|\"$)","",as.character(name))) %in%
- tolower(dbListTables(conn,sys_tables=T)))
+ tolower(dbListTables(conn, sys_tables=T)))
})
setMethod("dbGetException", "MonetDBConnection", def=function(conn, ...) {
@@ -215,7 +215,7 @@ setMethod("dbGetException", "MonetDBConn
setMethod("dbReadTable", "MonetDBConnection", def=function(conn, name, ...) {
if (!dbExistsTable(conn, name))
stop(paste0("Unknown table: ", name));
- dbGetQuery(conn,paste0("SELECT * FROM ", name))
+ dbGetQuery(conn, paste0("SELECT * FROM ", name))
})
# This one does all the work in this class
@@ -281,20 +281,28 @@ setMethod("dbSendQuery", signature(conn=
}
}
- return(new("MonetDBResult", env=env))
+ invisible(new("MonetDBResult", env=env))
})
# quoting
-setMethod("dbQuoteIdentifier", c("MonetDBConnection", "character"),
function(conn, x, ...) {
- qts <- !grepl("^[a-z][a-z0-9_]+$",x,perl=T)
- x[qts] <- paste('"', gsub('"', '""', x[qts], fixed = TRUE), '"', sep = "")
- SQL(x)
-})
+quoteIfNeeded <- function(conn, x, ...) {
+ chars <- !grepl("^[A-Za-z][A-Za-z0-9_]*$", x, perl=T) &&
!grepl("^\"[^\"]*\"$", x, perl=T)
+ if (any(chars)) {
+ message("Identifier(s) ", paste(x[chars], collapse=", "), " contain
reserved SQL characters and need to be quoted.")
+ }
+ reserved <- toupper(x) %in% .SQL92Keywords
+ if (any(reserved)) {
+ message("Identifier(s) ", paste(x[reserved], collapse=", "), " are
reserved SQL keywords and need to be quoted.")
+ }
+ qts <- reserved || chars
+ x[qts] <- dbQuoteIdentifier(conn, x[qts])
+ x
+}
-# overload as per DBI documentation
-setMethod("dbQuoteIdentifier", c("MonetDBConnection", "SQL"), function(conn,
x, ...) {x})
+# # overload as per DBI documentation
+# setMethod("dbQuoteIdentifier", c("MonetDBConnection", "SQL"), function(conn,
x, ...) {x})
# adapted from RMonetDB, very useful...
setMethod("dbWriteTable", "MonetDBConnection", def=function(conn, name, value,
overwrite=FALSE,
@@ -310,7 +318,8 @@ setMethod("dbWriteTable", "MonetDBConnec
if (overwrite && append) {
stop("Setting both overwrite and append to true makes no sense.")
}
- qname <- make.db.names(conn, name)
+
+ qname <- quoteIfNeeded(conn, name)
if (dbExistsTable(conn, qname)) {
if (overwrite) dbRemoveTable(conn, qname)
if (!overwrite && !append) stop("Table ", qname, " already exists. Set
overwrite=TRUE if you want
@@ -319,7 +328,7 @@ setMethod("dbWriteTable", "MonetDBConnec
}
if (!dbExistsTable(conn, qname)) {
fts <- sapply(value, dbDataType, dbObj=conn)
- fdef <- paste('"', make.db.names(conn, names(value)), '"', fts,
collapse=', ')
+ fdef <- paste(quoteIfNeeded(conn, names(value)), fts, collapse=', ')
ct <- paste("CREATE TABLE ", qname, " (", fdef, ")", sep= '')
dbSendUpdate(conn, ct)
}
@@ -458,8 +467,8 @@ monetdbRtype <- function(dbType) {
}
setMethod("fetch", signature(res="MonetDBResult", n="numeric"),
def=function(res, n, ...) {
- # dbGetQuery() still calls fetch(), thus no error message yet
- # warning("fetch() is deprecated, use dbFetch()")
+ # DBI on CRAN still uses fetch()
+ # message("fetch() is deprecated, use dbFetch()")
dbFetch(res, n, ...)
})
@@ -568,7 +577,7 @@ setMethod("dbFetch", signature(res="Mone
# if (getOption("monetdb.profile", T)) .profiler_clear()
- return(df)
+ df
})
@@ -615,7 +624,7 @@ monet.read.csv <- monetdb.read.csv <- fu
delim=",", newline="\\n",
quote="\"", create=TRUE, ...){
if (length(na.strings)>1) stop("na.strings must be of length 1")
- headers <- lapply(files, read.csv, sep=delim, na.strings=na.strings,
quote=quote, nrows=nrow.check,
+ headers <- lapply(files, utils::read.csv, sep=delim, na.strings=na.strings,
quote=quote, nrows=nrow.check,
...)
if (!missing(nrows)) {
diff --git a/clients/R/MonetDB.R/R/dplyr.R b/clients/R/MonetDB.R/R/dplyr.R
--- a/clients/R/MonetDB.R/R/dplyr.R
+++ b/clients/R/MonetDB.R/R/dplyr.R
@@ -13,7 +13,9 @@ src_translate_env.src_monetdb <- functio
n = function() dplyr::sql("COUNT(*)"),
sd = dplyr::sql_prefix("STDDEV_SAMP"),
var = dplyr::sql_prefix("VAR_SAMP"),
- median = dplyr::sql_prefix("MEDIAN")
+ median = dplyr::sql_prefix("MEDIAN"),
+ n_distinct = function(x) {dplyr::build_sql(dplyr::sql("count(distinct
"),
+ x, dplyr::sql(")"))}
)
)
}
diff --git a/clients/R/MonetDB.R/man/dbApply.Rd
b/clients/R/MonetDB.R/man/dbApply.Rd
new file mode 100644
--- /dev/null
+++ b/clients/R/MonetDB.R/man/dbApply.Rd
@@ -0,0 +1,35 @@
+\name{mdbapply}
+\alias{mdbapply}
+\alias{mdbapply,MonetDBConnection-method}
+
+\title{
+ Apply a R function to a MonetDB table.
+}
+\description{
+\code{dbApply} is used to switch the data from the normal auto-commiting mode
into transactional mode. Here, changes to the database will not be permanent
until \code{dbCommit} is called. If the changes are not to be kept around, you
can use \code{dbRollback} to undo all the changes since \code{dbTransaction}
was called.
+
+}
+\usage{
+ mdbapply(conn, table, fun, ...)
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