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new 47ebf538d Document the isdate function.
47ebf538d is described below
commit 47ebf538d63301de4df21425bc2998edf9d2feae
Author: James Turton <ja...@somecomputer.xyz>
AuthorDate: Fri Sep 2 07:57:57 2022 +0200
Document the isdate function.
---
.../030-date-time-functions-and-arithmetic.md | 29 ++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git
a/_docs/en/sql-reference/sql-functions/030-date-time-functions-and-arithmetic.md
b/_docs/en/sql-reference/sql-functions/030-date-time-functions-and-arithmetic.md
index 856f5350f..cb785f49a 100644
---
a/_docs/en/sql-reference/sql-functions/030-date-time-functions-and-arithmetic.md
+++
b/_docs/en/sql-reference/sql-functions/030-date-time-functions-and-arithmetic.md
@@ -19,6 +19,7 @@ This section covers the Drill [time zone
limitation]({{site.baseurl}}/docs/data-
| [DATE_DIFF]({{ site.baseurl
}}/docs/date-time-functions-and-arithmetic/#date_diff)
| DATE, TIMESTAMP |
| [DATE_PART]({{ site.baseurl
}}/docs/date-time-functions-and-arithmetic/#date_part)
| DOUBLE |
| [DATE_SUB]({{ site.baseurl
}}/docs/date-time-functions-and-arithmetic/#date_sub)
| DATE, TIMESTAMP |
+| [ISDATE]({{site.baseurl}}/docs/date-time-functions-and-arithmetic/#isdate)
| BOOLEAN |
| [LOCALTIME]({{ site.baseurl
}}/docs/date-time-functions-and-arithmetic/#other-date-and-time-functions)
| TIME |
| [LOCALTIMESTAMP]({{ site.baseurl
}}/docs/date-time-functions-and-arithmetic/#other-date-and-time-functions) |
TIMESTAMP |
| [NOW]({{ site.baseurl
}}/docs/date-time-functions-and-arithmetic/#other-date-and-time-functions)
| TIMESTAMP |
@@ -455,6 +456,34 @@ The `employee.json` file, which Drill includes in the
installation, lists the hi
|------------------------|
2 rows selected (0.161 seconds)
+## ISDATE
+Tests whether a character string represents a valid date. The test applied is
equivalent
+to asking whether an attempt to cast the string to date would succeed or fail.
+
+### ISDATE Syntax
+
+`isdate(date_string)`
+
+*date_string* is a character string possibly representing a valid date.
+
+### ISDATE Examples
+
+ SELECT ISDATE('1970-01-01');
+ |------------|
+ | EXPR$0 |
+ |------------|
+ | true |
+ |------------|
+ 1 row selected (0.098 seconds)
+
+ SELECT ISDATE('foobar');
+ |------------|
+ | EXPR$0 |
+ |------------|
+ | false |
+ |------------|
+ 1 row selected (0.088 seconds)
+
## Other Date and Time Functions
The following examples show how to use these functions:
