Adding upstream version 6.0.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

sqlglot/dialects/tableau.py

@@ -0,0 +1,37 @@
+from sqlglot import exp
+from sqlglot.dialects.dialect import Dialect
+from sqlglot.generator import Generator
+from sqlglot.helper import list_get
+from sqlglot.parser import Parser
+
+
+def _if_sql(self, expression):
+    return f"IF {self.sql(expression, 'this')} THEN {self.sql(expression, 'true')} ELSE {self.sql(expression, 'false')} END"
+
+
+def _coalesce_sql(self, expression):
+    return f"IFNULL({self.sql(expression, 'this')}, {self.expressions(expression)})"
+
+
+def _count_sql(self, expression):
+    this = expression.this
+    if isinstance(this, exp.Distinct):
+        return f"COUNTD({self.sql(this, 'this')})"
+    return f"COUNT({self.sql(expression, 'this')})"
+
+
+class Tableau(Dialect):
+    class Generator(Generator):
+        TRANSFORMS = {
+            **Generator.TRANSFORMS,
+            exp.If: _if_sql,
+            exp.Coalesce: _coalesce_sql,
+            exp.Count: _count_sql,
+        }
+
+    class Parser(Parser):
+        FUNCTIONS = {
+            **Parser.FUNCTIONS,
+            "IFNULL": exp.Coalesce.from_arg_list,
+            "COUNTD": lambda args: exp.Count(this=exp.Distinct(this=list_get(args, 0))),
+        }