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Fix td translations #1545

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merged 6 commits into from
Oct 24, 2024
Merged

Fix td translations #1545

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665eedd
Update numeric to float for double
rplsmn Oct 14, 2024
c898924
Update as.character
rplsmn Oct 14, 2024
e66987e
Add tests for changed td translations
rplsmn Oct 16, 2024
a49c400
add NEWS entry
simonpcouch Oct 24, 2024
5c40830
Update R/backend-teradata.R
rplsmn Oct 24, 2024
b59651a
cast to integer after type checking
simonpcouch Oct 24, 2024
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3 changes: 3 additions & 0 deletions NEWS.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,8 @@
# dbplyr (development version)

* Translations for `as.double()` and `as.character()` with Teradata previously
raised errors and are now correct (@rplsmn, #1545).

* Translations of `difftime()` for Postgres, SQL server, Redshift, and Snowflake
previously returned the wrong sign and are now correct (@edward-burn, #1532).

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8 changes: 6 additions & 2 deletions R/backend-teradata.R
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Expand Up @@ -109,8 +109,12 @@ sql_translation.Teradata <- function(con) {
digits <- vctrs::vec_cast(digits, integer())
sql_expr(CAST(!!x %as% DECIMAL(12L, !!digits)))
},
as.double = sql_cast("NUMERIC"),
as.character = sql_cast("VARCHAR(MAX)"),
as.double = sql_cast("FLOAT"),
as.character = function(x, nchar = 255L) {
check_number_whole(nchar, min = 0, max = 64000)
nchar <- vctrs::vec_cast(nchar, integer())
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sql_expr(CAST(!!x %as% VARCHAR(!!nchar)))
},
as.Date = teradata_as_date,
log10 = sql_prefix("LOG"),
log = sql_log(),
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5 changes: 3 additions & 2 deletions tests/testthat/test-backend-teradata.R
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Expand Up @@ -4,8 +4,9 @@ test_that("custom scalar translated correctly", {
expect_equal(test_translate_sql(x != y), sql("`x` <> `y`"))
expect_equal(test_translate_sql(as.numeric(x)), sql("CAST(`x` AS DECIMAL(12, 9))"))
expect_equal(test_translate_sql(as.numeric(x, 8)), sql("CAST(`x` AS DECIMAL(12, 8))"))
expect_equal(test_translate_sql(as.double(x)), sql("CAST(`x` AS NUMERIC)"))
expect_equal(test_translate_sql(as.character(x)), sql("CAST(`x` AS VARCHAR(MAX))"))
expect_equal(test_translate_sql(as.double(x)), sql("CAST(`x` AS FLOAT)"))
expect_equal(test_translate_sql(as.character(x)), sql("CAST(`x` AS VARCHAR(255))"))
expect_equal(test_translate_sql(as.character(x, 12)), sql("CAST(`x` AS VARCHAR(12))"))
expect_equal(test_translate_sql(log(x)), sql("LN(`x`)"))
expect_equal(test_translate_sql(cot(x)), sql("1 / TAN(`x`)"))
expect_equal(test_translate_sql(nchar(x)), sql("CHARACTER_LENGTH(`x`)"))
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