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Asked: 2026-06-01T13:14:51+00:00

I am using the Geospatial extension for MySQL. In the MyISAM table listings there

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I am using the Geospatial extension for MySQL. In the MyISAM table listings there is a GEOMETRY column p, and 2 float columns lat and lng. Values in p are set using UPDATE listings SET p = POINT(lat, lng);.

Problem: Now I want to set a spatial index on column p. When I tried:

ALTER TABLE listings ADD SPATIAL INDEX(p);

and also tried: 

CREATE SPATIAL INDEX sp_index ON listings (p);

Both times, I get the error error : All parts of a SPATIAL index must be NOT NULL.

So (using Navicat) I tried making col p NOT NULL, but it requires a default value. What default value should I use for this? I tried using '' as the default value but it gave an error invalid default value for 'p'.

I tried setting the default value for p as POINT(0,0) but I get the error BLOB/TEXT column 'p' can't have a default value

How should I approach this problem to create the spatial index? Thanks!

Edit

After running query ALTER TABLE listings CHANGE p p POINT NOT NULL, running ADD SPATIAL INDEX(p) causes a strange error Lost connection to MySQL server during query. Other queries that does not involve creating an index works fine ie. SELECT * FROM listings

Results from SHOW CREATE TABLE listings

CREATE TABLE `listings` (
 `listing_id` int(8) NOT NULL AUTO_INCREMENT,
 `url` varchar(255) DEFAULT NULL,
 `website_city` varchar(32) DEFAULT NULL,
 `website` varchar(32) DEFAULT NULL,
 `price` int(7) DEFAULT NULL,
 `price_per_br` int(7) DEFAULT NULL,
 `bedroom` int(2) DEFAULT NULL,
 `bathroom` int(2) DEFAULT NULL,
 `fee` varchar(10) DEFAULT NULL,
 `address_1` varchar(255) DEFAULT NULL,
 `address_2` varchar(255) DEFAULT NULL,
 `city` varchar(64) DEFAULT NULL,
 `state` varchar(32) DEFAULT NULL,
 `postal` int(6) DEFAULT NULL,
 `retrival_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 `post_timestamp` timestamp NULL DEFAULT NULL,
 `lat` float(10,6) DEFAULT NULL,
 `lng` float(10,6) DEFAULT NULL,
 `p` point NOT NULL,
 `description` text,
 `img_subpath` varchar(15) DEFAULT NULL,
 `photos` text,
 `reply_email` varchar(255) DEFAULT NULL,
 `phone` varchar(16) DEFAULT NULL,
 `has_dishwasher` tinyint(1) DEFAULT NULL,
 `has_laundry` tinyint(1) DEFAULT NULL,
 `has_fireplace` tinyint(1) DEFAULT NULL,
 `has_elevator` tinyint(1) DEFAULT NULL,
 `has_balcony` tinyint(1) DEFAULT NULL,
 `has_deck` tinyint(1) DEFAULT NULL,
 `has_backyard` tinyint(1) DEFAULT NULL,
 `has_parking` tinyint(1) DEFAULT NULL,
 `has_gym` tinyint(1) DEFAULT NULL,
 `has_pool` tinyint(1) DEFAULT NULL,
 `cats_ok` tinyint(1) DEFAULT NULL,
 `dogs_ok` tinyint(1) DEFAULT NULL,
 PRIMARY KEY (`listing_id`),
 KEY `lat lng` (`lat`,`lng`,`price`,`price_per_br`,`bedroom`,`bathroom`,`post_timestamp`) USING BTREE,
 KEY `spatial` (`p`(25))
) ENGINE=MyISAM AUTO_INCREMENT=589605 DEFAULT CHARSET=latin1

I converted p to back to GEOMETRY, ran the query to add the index to p and got a new error Cannot get geometry object from data you send to the GEOMETRY field

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1 Answer

  1. Editorial Team

    This page InformIT: Data Types in MySQL claims that spatial columns cannot have a DEFAULT value but I can’t locate that info in MySQL docs:

    3.2.3 Specifying Column Default Values

    For all but BLOB and TEXT types, spatial types, or columns with the AUTO_INCREMENT attribute, you can specify a DEFAULT def_value clause to indicate that …

    Testing in my 5.1 box shows the same error as yours. So the claim is probably correct.

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