Adding support for IIF for Synapse. Fixes #342

NEWS.md

@@ -7,6 +7,8 @@ Changes:
 
 2. The `render()`, `translate()`, and `translateSingleStatement()` functions now preserve attributes of the SQL object.
 
+3. Adding support for `IIF` for Synapse.
+
 SqlRender 1.15.2
 ================
 

inst/csv/replacementPatterns.csv

@@ -1341,6 +1341,7 @@ synapse,CREATE INDEX @index_name ON #@table (@variable);,-- synapse does not sup
 synapse,"CONSTRAINT @a DEFAULT GETDATE()",""
 synapse,"DEFAULT GETDATE()",""
 synapse,CREATE INDEX @index_name ON @table (@variable) WHERE @b;,CREATE INDEX @index_name ON @table (@variable);
+synapse,"IIF(@condition, @whentrue, @whenfalse)","CASE WHEN @condition THEN @whentrue ELSE @whenfalse END"
 sql server,.@([^\s]+)p2...@([0-9]+)p3,x@p2...@p3
 sql server,.@([^\s]+)p2...@([0-9]+)p3,x@p2...@p3
 sql server,...@([0-9]+|y)a,xxx@a

tests/testthat/test-translate-synapse.R

@@ -38,3 +38,8 @@ test_that("translate sql server -> synapse CREATE INDEX with WHERE", {
  sql <- translate("CREATE INDEX idx_a ON a(c1, c2) WHERE c3 <> '';", targetDialect = "synapse")
  expect_equal_ignore_spaces(sql, "CREATE INDEX idx_a ON a(c1, c2);")
 })
+
+test_that("translate sql server -> synapse IIF", {
+ sql <- translate("SELECT IIF(a>b, 1, b) AS max_val FROM table;", targetDialect = "synapse")
+ expect_equal_ignore_spaces(sql, "SELECT CASE WHEN a>b THEN 1 ELSE b END AS max_val FROM table ;")
+})