pre_sql_to_query

DBI connnection or rquery_db_info object

db_info

generic additional arguments (not used).

character if not NULL name of source table.

source_table

numeric if not NULL limit sources to this many rows.

source_limit

character, if not NULL set of columns used from above.

using

internal

A piped query generator based on Edgar F. Codd's relational
algebra, and on production experience using 'SQL' and 'dplyr' at big data
scale.  The design represents an attempt to make 'SQL' more teachable by
denoting composition by a sequential pipeline notation instead of nested
queries or functions.   The implementation delivers reliable high
performance data processing on large data systems such as 'Spark',
databases, and 'data.table'. Package features include: data processing trees
or pipelines as observable objects (able to report both columns
produced and columns used), optimized 'SQL' generation as an explicit
user visible table modeling step, plus explicit query reasoning and checking.

pre_sql_to_query: Return SQL transform of tokens.

Description

Usage

Arguments

Value