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Update docs to reflect recent changes. (#285) (opensearch-project#1826)
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* Update docs.

* Apply suggestions from code review

* Add example of quote escaping.

* Update docs/user/general/datatypes.rst

* Update docs/user/general/datatypes.rst

---------

Signed-off-by: Yury-Fridlyand <[email protected]>
Co-authored-by: Forest Vey <[email protected]>
Co-authored-by: Matthew Wells <[email protected]>
Signed-off-by: Mitchell Gale <[email protected]>
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@Yury-Fridlyand @forestmvey
@matthewryanwells @MitchellGale
3 people authored and MitchellGale committed Jul 11, 2023
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2 changes: 1 addition & 1 deletion docs/user/dql/expressions.rst
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Expand Up @@ -160,7 +160,7 @@ Here is an example for different type of comparison operators::
+---------+----------+---------+----------+----------+---------+

It is possible to compare datetimes. When comparing different datetime types, for example `DATE` and `TIME`, both converted to `DATETIME`.
The following rule is applied on coversion: a `TIME` applied to today's date; `DATE` is interpreted at midnight.
The following rule is applied on coversion: a `TIME` applied to today's date; `DATE` is interpreted at midnight. See example below::

os> SELECT current_time() > current_date() AS `now.time > today`, typeof(current_time()) AS `now.time.type`, typeof(current_date()) AS `now.date.type`;
fetched rows / total rows = 1/1
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107 changes: 91 additions & 16 deletions docs/user/general/datatypes.rst
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Expand Up @@ -155,15 +155,15 @@ The following matrix illustrates the conversions allowed by our query engine for
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| STRING | E | E | E | E | E | E | IE | X | X | N/A | IE | IE | IE | IE | X | X | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| TIMESTAMP | X | X | X | X | X | X | X | X | X | E | N/A | | | X | X | X | X | X | X | X |
| TIMESTAMP | X | X | X | X | X | X | X | X | X | E | N/A | IE | IE | IE | X | X | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| DATE | X | X | X | X | X | X | X | X | X | E | | N/A | | X | X | X | X | X | X | X |
| DATE | X | X | X | X | X | X | X | X | X | E | E | N/A | IE | E | X | X | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| TIME | X | X | X | X | X | X | X | X | X | E | | | N/A | X | X | X | X | X | X | X |
| TIME | X | X | X | X | X | X | X | X | X | E | E | E | N/A | E | X | X | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| DATETIME | X | X | X | X | X | X | X | X | X | E | | | | N/A | X | X | X | X | X | X |
| DATETIME | X | X | X | X | X | X | X | X | X | E | E | E | E | N/A | X | X | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| INTERVAL | X | X | X | X | X | X | X | X | X | E | | | | X | N/A | X | X | X | X | X |
| INTERVAL | X | X | X | X | X | X | X | X | X | E | X | X | X | X | N/A | X | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
| GEO_POINT | X | X | X | X | X | X | X | X | X | | X | X | X | X | X | N/A | X | X | X | X |
+--------------+------+-------+---------+------+-------+--------+---------+--------------+------+--------+-----------+------+------+----------+----------+-----------+-----+--------+-----------+---------+
Expand Down Expand Up @@ -236,8 +236,7 @@ Numeric values ranged from -2147483648 to +2147483647 are recognized as integer
Date and Time Data Types
========================

The date and time data types are the types that represent temporal values and SQL plugin supports types including DATE, TIME, DATETIME, TIMESTAMP and INTERVAL. By default, the OpenSearch DSL uses date type as the only date and time related type, which has contained all information about an absolute time point. To integrate with SQL language, each of the types other than timestamp is holding part of temporal or timezone information, and the usage to explicitly clarify the date and time types is reflected in the datetime functions (see `Functions <functions.rst>`_ for details), where some functions might have restrictions in the input argument type.

The datetime types supported by the SQL plugin are ``DATE``, ``TIME``, ``DATETIME``, ``TIMESTAMP``, and ``INTERVAL``, with date and time being used to represent temporal values. By default, the OpenSearch DSL uses ``date`` type as the only date and time related type as it contains all information about an absolute time point. To integrate with SQL language each of the types other than timestamp hold part of the temporal or timezone information. This information can be used to explicitly clarify the date and time types reflected in the datetime functions (see `Functions <functions.rst>`_ for details), where some functions might have restrictions in the input argument type.

Date
----
Expand Down Expand Up @@ -299,7 +298,7 @@ Interval data type represents a temporal duration or a period. The syntax is as
| Interval | INTERVAL expr unit |
+----------+--------------------+

The expr is any expression that can be iterated to a quantity value eventually, see `Expressions <expressions.rst>`_ for details. The unit represents the unit for interpreting the quantity, including MICROSECOND, SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER and YEAR.The INTERVAL keyword and the unit specifier are not case sensitive. Note that there are two classes of intervals. Year-week intervals can store years, quarters, months and weeks. Day-time intervals can store days, hours, minutes, seconds and microseconds. Year-week intervals are comparable only with another year-week intervals. These two types of intervals can only comparable with the same type of themselves.
The expr is any expression that can be iterated to a quantity value eventually, see `Expressions <expressions.rst>`_ for details. The unit represents the unit for interpreting the quantity, including ``MICROSECOND``, ``SECOND``, ``MINUTE``, ``HOUR``, ``DAY``, ``WEEK``, ``MONTH``, ``QUARTER`` and ``YEAR``. The ``INTERVAL`` keyword and the unit specifier are not case sensitive. Note that there are two classes of intervals. Year-week intervals can store years, quarters, months and weeks. Day-time intervals can store days, hours, minutes, seconds and microseconds. Year-week intervals are comparable only with another year-week intervals. These two types of intervals can only comparable with the same type of themselves.


Conversion between date and time types
Expand All @@ -320,7 +319,7 @@ Conversion from DATE
Conversion from TIME
>>>>>>>>>>>>>>>>>>>>

- Time value cannot be converted to any other date and time types since it does not contain any date information, so it is not meaningful to give no date info to a date/datetime/timestamp instance.
- When time value is converted to any other datetime types, the date part of the new value is filled up with today's date, like with the `CURDATE` function. For example, a time value X converted to a timestamp would produce today's date at time X.


Conversion from DATETIME
Expand Down Expand Up @@ -354,18 +353,94 @@ A string can also represent and be converted to date and time types (except to i
| True | False | True |
+------------------------------------------------------------+-------------------------------------+----------------------------------+

Please, see `more examples here <../dql/expressions.rst#toc-entry-15>`_.

Date formats
------------

SQL plugin supports all named formats for OpenSearch ``date`` data type, custom formats and their combination. Please, refer to `OpenSearch docs <https://opensearch.org/docs/latest/field-types/supported-field-types/date/>`_ for format description.
Plugin detects which type of data is stored in ``date`` field according to formats given and returns results in the corresponding SQL types.
Given an index with the following mapping.

.. code-block:: json
{
"mappings" : {
"properties" : {
"date1" : {
"type" : "date",
"format": "yyyy-MM-dd"
},
"date2" : {
"type" : "date",
"format": "date_time_no_millis"
},
"date3" : {
"type" : "date",
"format": "hour_minute_second"
},
"date4" : {
"type" : "date"
},
"date5" : {
"type" : "date",
"format": "yyyy-MM-dd || time"
}
}
}
}
Querying such index will provide a response with ``schema`` block as shown below.

.. code-block:: json
{
"query" : "SELECT * from date_formats LIMIT 0;"
}
.. code-block:: json
{
"schema": [
{
"name": "date5",
"type": "timestamp"
},
{
"name": "date4",
"type": "timestamp"
},
{
"name": "date3",
"type": "time"
},
{
"name": "date2",
"type": "timestamp"
},
{
"name": "date1",
"type": "date"
},
],
"datarows": [],
"total": 0,
"size": 0,
"status": 200
}
String Data Types
=================

A string is a sequence of characters enclosed in either single or double quotes. For example, both 'text' and "text" will be treated as string literal. To use quote characters in a string literal, you can use two quotes of the same type as the enclosing quotes::
A string is a sequence of characters enclosed in either single or double quotes. For example, both 'text' and "text" will be treated as string literal. To use quote characters in a string literal, you can use two quotes of the same type as the enclosing quotes or a backslash symbol (``\``)::

os> SELECT 'hello', "world", '"hello"', "'world'", '''hello''', """world"""
os> SELECT 'hello', "world", '"hello"', "'world'", '''hello''', """world""", 'I\'m', 'I''m', "I\"m"
fetched rows / total rows = 1/1
+-----------+-----------+-------------+-------------+---------------+---------------+
| 'hello' | "world" | '"hello"' | "'world'" | '''hello''' | """world""" |
|-----------+-----------+-------------+-------------+---------------+---------------|
| hello | world | "hello" | 'world' | 'hello' | "world" |
+-----------+-----------+-------------+-------------+---------------+---------------+
+-----------+-----------+-------------+-------------+---------------+---------------+----------+----------+----------+
| 'hello' | "world" | '"hello"' | "'world'" | '''hello''' | """world""" | 'I\'m' | 'I''m' | "I\"m" |
|-----------+-----------+-------------+-------------+---------------+---------------+----------+----------+----------|
| hello | world | "hello" | 'world' | 'hello' | "world" | I'm | I'm | I"m |
+-----------+-----------+-------------+-------------+---------------+---------------+----------+----------+----------+

Boolean Data Types
==================
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