materialize_relop_list_stages(db, collector, ..., narrow = TRUE,
  limit = NULL, source_limit = NULL, overwrite = TRUE,
  temporary = TRUE)

Arguments

db

database connecton (rquery_db_info class preferred, or DBI connections).

collector

a rquery::relop_list

...

force later arguments to bind by name.

narrow

logical, if TRUE add select_columns() to narrow stages.

limit

numeric if not NULL result limit (to use this, last statement must not have a limit).

source_limit

numeric if not NULL limit sources to this many rows.

overwrite

logical if TRUE drop an previous table.

temporary

logical if TRUE try to create a temporary table.

Value

a rquery::relop_table_source representing ops's materialization.

See also

Examples

if(requireNamespace("DBI", quietly = TRUE) && requireNamespace("RSQLite", quietly = TRUE) ) { rsqlite_connection <- DBI::dbConnect(RSQLite::SQLite(), ":memory:") db <- rquery_db_info( connection = rsqlite_connection, is_dbi = TRUE ) collector <- make_relop_list() d <- rq_copy_to(db, "d", data.frame(x = 1, y = 2), temporary = TRUE, overwrite = TRUE) ops1 <- d %.>% extend(., z %:=% x + y) %.>% collector ops2 <- ops1 %.>% extend(., z2 %:=% x / y) %.>% collector get_relop_list_stages(collector) res <- materialize_relop_list_stages(db, collector) res execute(db, res) DBI::dbDisconnect(rsqlite_connection) }