Conditional Functions
- Capella Columnar
- reference
This topic describes the builtin SQL++ for Capella columnar conditional functions.
if_null (ifnull)
-
Syntax:
if_null(expression1, expression2, ... expressionN)
-
Finds first argument which value is not
null
and returns that value -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
a
null
if all arguments evaluate tonull
or no arguments specified -
a value of the first non-
null
argument otherwise
-
-
Example:
{ "a": if_null(), "b": if_null(null), "c": if_null(null, "analytics"), "d": is_missing(if_null(missing)) };
-
The expected result is:
{ "a": null, "b": null, "c": "analytics", "d": true }
The function has an alias ifnull
.
if_missing (ifmissing)
-
Syntax:
if_missing(expression1, expression2, ... expressionN)
-
Finds first argument which value is not
missing
and returns that value -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
a
null
if all arguments evaluate tomissing
or no arguments specified -
a value of the first non-
missing
argument otherwise
-
-
Example:
{ "a": if_missing(), "b": if_missing(missing), "c": if_missing(missing, "analytics"), "d": if_missing(null, "analytics") };
-
The expected result is:
{ "a": null, "b": null, "c": "analytics", "d": null }
The function has an alias ifmissing
.
if_missing_or_null (ifmissingornull, coalesce)
-
Syntax:
if_missing_or_null(expression1, expression2, ... expressionN)
-
Finds first argument which value is not
null
ormissing
and returns that value -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
a
null
if all arguments evaluate to eithernull
ormissing
, or no arguments specified -
a value of the first non-
null
, non-missing
argument otherwise
-
-
Example:
{ "a": if_missing_or_null(), "b": if_missing_or_null(null, missing), "c": if_missing_or_null(null, missing, "analytics") };
-
The expected result is:
{ "a": null, "b": null, "c": "analytics" }
The function has two aliases: ifmissingornull
and coalesce
.
if_inf (ifinf)
-
Syntax:
if_inf(expression1, expression2, ... expressionN)
-
Finds first argument which is a non-infinite (
INF
or-INF
) number -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
a
missing
ifmissing
argument was encountered before the first non-infinite number argument -
a
null
ifnull
argument or any other non-number argument was encountered before the first non-infinite number argument -
the first non-infinite number argument otherwise
-
-
Example:
{ "a": is_null(if_inf(null)), "b": is_missing(if_inf(missing)), "c": is_null(if_inf(double("INF"))), "d": if_inf(1, null, missing) ], "e": is_null(if_inf(null, missing, 1)) ], "f": is_missing(if_inf(missing, null, 1)) ], "g": if_inf(float("INF"), 1) ], "h": to_string(if_inf(float("INF"), double("NaN"), 1)) ] };
-
The expected result is:
{ "a": true, "b": true, "c": true, "d": 1, "e": true, "f": true, "g": 1, "h": "NaN" }
The function has an alias ifinf
.
if_nan (ifnan)
-
Syntax:
if_nan(expression1, expression2, ... expressionN)
-
Finds first argument which is a non-
NaN
number -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
a
missing
ifmissing
argument was encountered before the first non-NaN
number argument -
a
null
ifnull
argument or any other non-number argument was encountered before the first non-NaN
number argument -
the first non-
NaN
number argument otherwise
-
-
Example:
{ "a": is_null(if_nan(null)), "b": is_missing(if_nan(missing)), "c": is_null(if_nan(double("NaN"))), "d": if_nan(1, null, missing) ], "e": is_null(if_nan(null, missing, 1)) ], "f": is_missing(if_nan(missing, null, 1)) ], "g": if_nan(float("NaN"), 1) ], "h": to_string(if_nan(float("NaN"), double("INF"), 1)) ] };
-
The expected result is:
{ "a": true, "b": true, "c": true, "d": 1, "e": true, "f": true, "g": 1, "h": "INF" }
The function has an alias ifnan
.
if_nan_or_inf (ifnanorinf)
-
Syntax:
if_nan_or_inf(expression1, expression2, ... expressionN)
-
Finds first argument which is a non-infinite (
INF
or-INF
) and non-NaN
number -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
a
missing
ifmissing
argument was encountered before the first non-infinite and non-NaN
number argument -
a
null
ifnull
argument or any other non-number argument was encountered before the first non-infinite and non-NaN
number argument -
the first non-infinite and non-
NaN
number argument otherwise
-
-
Example:
{ "a": is_null(if_nan_or_inf(null)), "b": is_missing(if_nan_or_inf(missing)), "c": is_null(if_nan_or_inf(double("NaN"), double("INF"))), "d": if_nan_or_inf(1, null, missing) ], "e": is_null(if_nan_or_inf(null, missing, 1)) ], "f": is_missing(if_nan_or_inf(missing, null, 1)) ], "g": if_nan_or_inf(float("NaN"), float("INF"), 1) ], };
-
The expected result is:
{ "a": true, "b": true, "c": true, "d": 1, "e": true, "f": true, "g": 1 }
The function has an alias ifnanorinf
.
null_if (nullif)
-
Syntax:
null_if(expression1, expression2)
-
Compares two arguments and returns
null
if they are equal, otherwise returns the first argument. -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
missing
if any argument is amissing
value, -
null
if-
any argument is a
null
value but no argument is amissing
value, or -
argument1
=argument2
-
-
a value of the first argument otherwise
-
-
Example:
{ "a": null_if("analytics", "analytics"), "b": null_if(1, 2) };
-
The expected result is:
{ "a": null, "b": 1 }
The function has an alias nullif
.
missing_if (missingif)
-
Syntax:
missing_if(expression1, expression2)
-
Compares two arguments and returns
missing
if they are equal, otherwise returns the first argument. -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
missing
if-
any argument is a
missing
value, or -
no argument is a
null
value andargument1
=argument2
-
-
null
if any argument is anull
value but no argument is amissing
value -
a value of the first argument otherwise
-
-
Example:
{ "a": missing_if("analytics", "analytics") "b": missing_if(1, 2), };
-
The expected result is:
{ "b": 1 }
The function has an alias missingif
.
nan_if (nanif)
-
Syntax:
nan_if(expression1, expression2)
-
Compares two arguments and returns
NaN
value if they are equal, otherwise returns the first argument. -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
missing
if any argument is amissing
value, -
null
if any argument is anull
value but no argument is amissing
value -
NaN
value of typedouble
ifargument1
=argument2
-
a value of the first argument otherwise
-
-
Example:
{ "a": to_string(nan_if("analytics", "analytics")), "b": nan_if(1, 2) };
-
The expected result is:
{ "a": "NaN", "b": 1 }
The function has an alias nanif
.
posinf_if (posinfif)
-
Syntax:
posinf_if(expression1, expression2)
-
Compares two arguments and returns
+INF
value if they are equal, otherwise returns the first argument. -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
missing
if any argument is amissing
value, -
null
if any argument is anull
value but no argument is amissing
value -
+INF
value of typedouble
ifargument1
=argument2
-
a value of the first argument otherwise
-
-
Example:
{ "a": to_string(posinf_if("analytics", "analytics")), "b": posinf_if(1, 2) };
-
The expected result is:
{ "a": "+INF", "b": 1 }
The function has an alias posinfif
.
neginf_if (neginfif)
-
Syntax:
neginf_if(expression1, expression2)
-
Compares two arguments and returns
-INF
value if they are equal, otherwise returns the first argument. -
Arguments:
-
expressionI
: an expression of any type.
-
-
Return Value:
-
missing
if any argument is amissing
value, -
null
if any argument is anull
value but no argument is amissing
value -
-INF
value of typedouble
ifargument1
=argument2
-
a value of the first argument otherwise
-
-
Example:
{ "a": to_string(neginf_if("analytics", "analytics")), "b": neginf_if(1, 2) };
-
The expected result is:
{ "a": "-INF", "b": 1 }
The function has an alias neginfif
.