[doc](function) Add ST_XMAX/ST_XMIN/ST_YMAX/ST_YMIN documentation

docs/sql-manual/sql-functions/scalar-functions/spatial-functions/st-xmax.md

@@ -0,0 +1,102 @@
+---
+{
+    "title": "ST_XMAX",
+    "language": "en",
+    "description": "Returns the maximum X (longitude) coordinate of the bounding box of a geometry."
+}
+---
+
+## Description
+
+Returns the maximum X (longitude) coordinate of the bounding box of a geometry.
+
+## Syntax
+
+```sql
+ST_XMAX( <geometry>)
+```
+
+## Parameters
+
+| Parameter | Description |
+|------|----------|
+| `<geometry>` | The geometry object from which to extract the maximum X coordinate of the bounding box. |
+
+## Return Value
+
+The the maximum X coordinate of the bounding box, of type double-precision floating-point number (Double).
+
+- Returns the maximum X coordinate of the bounding box if the input is a valid geometry object.
+- Returns NULL if the input is NULL or an invalid geometry (e.g., a non-geometry string).
+
+## Example
+
+Extract the maximum X coordinate of the bounding box of a point
+
+```sql
+SELECT ST_XMax(ST_Point(24.7, 56.7));
+```
+
+```text
++---------------------------------+
+| ST_XMax(st_point(24.7, 56.7)) |
++---------------------------------+
+|                            24.7 |
++---------------------------------+
+```
+
+Extract the maximum X coordinate of the bounding box of a linestring
+
+```sql
+SELECT ST_XMax(ST_LineStringFromText('LINESTRING (0 0, 4 4)'));
+```
+
+```text
++---------------------------------------------------------+
+| ST_XMax(st_linestringfromtext('LINESTRING (0 0, 4 4)')) |
++---------------------------------------------------------+
+|                                                       4 |
++---------------------------------------------------------+
+```
+
+Extract the maximum X coordinate of the bounding box of a polygon
+
+```sql
+SELECT ST_XMax(ST_Polygon('POLYGON ((0 0, 4 0, 4 3, 0 3, 0 0))'));
+```
+
+```text
++------------------------------------------------------------------+
+| ST_XMax(st_polygon('POLYGON ((0 0, 4 0, 4 3, 0 3, 0 0))')) |
++------------------------------------------------------------------+
+|                                                                4 |
++------------------------------------------------------------------+
+```
+
+Input is an invalid geometry
+
+```sql
+SELECT ST_XMax('not a geometry');
+```
+
+```text
++------------------------------------------+
+| ST_XMax('not a geometry') |
++------------------------------------------+
+|                                     NULL |
++------------------------------------------+
+```
+
+Input is NULL
+
+```sql
+SELECT ST_XMax(NULL);
+```
+
+```text
++-------------------------+
+| ST_XMax(null) |
++-------------------------+
+|                    NULL |
++-------------------------+
+```

docs/sql-manual/sql-functions/scalar-functions/spatial-functions/st-xmin.md

@@ -0,0 +1,102 @@
+---
+{
+    "title": "ST_XMIN",
+    "language": "en",
+    "description": "Returns the minimum X (longitude) coordinate of the bounding box of a geometry."
+}
+---
+
+## Description
+
+Returns the minimum X (longitude) coordinate of the bounding box of a geometry.
+
+## Syntax
+
+```sql
+ST_XMIN( <geometry>)
+```
+
+## Parameters
+
+| Parameter | Description |
+|------|----------|
+| `<geometry>` | The geometry object from which to extract the minimum X coordinate of the bounding box. |
+
+## Return Value
+
+The the minimum X coordinate of the bounding box, of type double-precision floating-point number (Double).
+
+- Returns the minimum X coordinate of the bounding box if the input is a valid geometry object.
+- Returns NULL if the input is NULL or an invalid geometry (e.g., a non-geometry string).
+
+## Example
+
+Extract the minimum X coordinate of the bounding box of a point
+
+```sql
+SELECT ST_XMin(ST_Point(24.7, 56.7));
+```
+
+```text
++---------------------------------+
+| ST_XMin(st_point(24.7, 56.7)) |
++---------------------------------+
+|                            24.7 |
++---------------------------------+
+```
+
+Extract the minimum X coordinate of the bounding box of a linestring
+
+```sql
+SELECT ST_XMin(ST_LineStringFromText('LINESTRING (0 0, 4 4)'));
+```
+
+```text
++---------------------------------------------------------+
+| ST_XMin(st_linestringfromtext('LINESTRING (0 0, 4 4)')) |
++---------------------------------------------------------+
+|                                                       4 |
++---------------------------------------------------------+
+```
+
+Extract the minimum X coordinate of the bounding box of a polygon
+
+```sql
+SELECT ST_XMin(ST_Polygon('POLYGON ((0 0, 4 0, 4 3, 0 3, 0 0))'));
+```
+
+```text
++------------------------------------------------------------------+
+| ST_XMin(st_polygon('POLYGON ((0 0, 4 0, 4 3, 0 3, 0 0))')) |
++------------------------------------------------------------------+
+|                                                                4 |
++------------------------------------------------------------------+
+```
+
+Input is an invalid geometry
+
+```sql
+SELECT ST_XMin('not a geometry');
+```
+
+```text
++------------------------------------------+
+| ST_XMin('not a geometry') |
++------------------------------------------+
+|                                     NULL |
++------------------------------------------+
+```
+
+Input is NULL
+
+```sql
+SELECT ST_XMin(NULL);
+```
+
+```text
++-------------------------+
+| ST_XMin(null) |
++-------------------------+
+|                    NULL |
++-------------------------+
+```

docs/sql-manual/sql-functions/scalar-functions/spatial-functions/st-ymax.md

@@ -0,0 +1,102 @@
+---
+{
+    "title": "ST_YMAX",
+    "language": "en",
+    "description": "Returns the maximum Y (latitude) coordinate of the bounding box of a geometry."
+}
+---
+
+## Description
+
+Returns the maximum Y (latitude) coordinate of the bounding box of a geometry.
+
+## Syntax
+
+```sql
+ST_YMAX( <geometry>)
+```
+
+## Parameters
+
+| Parameter | Description |
+|------|----------|
+| `<geometry>` | The geometry object from which to extract the maximum Y coordinate of the bounding box. |
+
+## Return Value
+
+The the maximum Y coordinate of the bounding box, of type double-precision floating-point number (Double).
+
+- Returns the maximum Y coordinate of the bounding box if the input is a valid geometry object.
+- Returns NULL if the input is NULL or an invalid geometry (e.g., a non-geometry string).
+
+## Example
+
+Extract the maximum Y coordinate of the bounding box of a point
+
+```sql
+SELECT ST_YMax(ST_Point(24.7, 56.7));
+```
+
+```text
++---------------------------------+
+| ST_YMax(st_point(24.7, 56.7)) |
++---------------------------------+
+|                            24.7 |
++---------------------------------+
+```
+
+Extract the maximum Y coordinate of the bounding box of a linestring
+
+```sql
+SELECT ST_YMax(ST_LineStringFromText('LINESTRING (0 0, 4 4)'));
+```
+
+```text
++---------------------------------------------------------+
+| ST_YMax(st_linestringfromtext('LINESTRING (0 0, 4 4)')) |
++---------------------------------------------------------+
+|                                                       4 |
++---------------------------------------------------------+
+```
+
+Extract the maximum Y coordinate of the bounding box of a polygon
+
+```sql
+SELECT ST_YMax(ST_Polygon('POLYGON ((0 0, 4 0, 4 3, 0 3, 0 0))'));
+```
+
+```text
++------------------------------------------------------------------+
+| ST_YMax(st_polygon('POLYGON ((0 0, 4 0, 4 3, 0 3, 0 0))')) |
++------------------------------------------------------------------+
+|                                                                4 |
++------------------------------------------------------------------+
+```
+
+Input is an invalid geometry
+
+```sql
+SELECT ST_YMax('not a geometry');
+```
+
+```text
++------------------------------------------+
+| ST_YMax('not a geometry') |
++------------------------------------------+
+|                                     NULL |
++------------------------------------------+
+```
+
+Input is NULL
+
+```sql
+SELECT ST_YMax(NULL);
+```
+
+```text
++-------------------------+
+| ST_YMax(null) |
++-------------------------+
+|                    NULL |
++-------------------------+
+```