/[volute]/trunk/projects/dal/ADQL/ADQL.tex
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revision 4586 by yrvafhom, Tue Nov 28 03:04:55 2017 UTC revision 4587 by yrvafhom, Tue Nov 28 04:07:45 2017 UTC
# Line 1136  Line 1136 
1136  The details of how CLOB values are handled within a  The details of how CLOB values are handled within a
1137  database is implementation dependent.  database is implementation dependent.
1138    
1139    An example use case for CLOB is a URL field that is generated on the fly
1140    using one or more fields stored the database.
1141    Although some of the components are stored in the database, the final URL
1142    that appears in the results is not stored in the database.
1143    Hence it would not be possible to apply ADQL functions or operators to the
1144    URL field without special knowledge of the internal database structure.
1145    However, a service implementation could provide user defined functions
1146    that used knowledge of the internal database structure to perform
1147    specific operations on the generated URL field.
1148    
1149  \subsection{Binary types}  \subsection{Binary types}
1150  \label{sec:types.binary}  \label{sec:types.binary}
1151    
# Line 1229  Line 1239 
1239  The details of how BLOB values are handled within a  The details of how BLOB values are handled within a
1240  database is implementation dependent.  database is implementation dependent.
1241    
1242    An example use case for BLOB is for storing thumbnail images
1243    in the database alongside the tabular data.
1244    ADQL does not provide functions or operations that operate on
1245    images.
1246    However, a service implementation could provide user defined
1247    functions that use implemetation specific features to perform
1248    operations on the image data.
1249    
1250  \subsection{Geometric types}  \subsection{Geometric types}
1251  \label{sec:types.geom}  \label{sec:types.geom}
1252    

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