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><DIV
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><H1
><A
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></A
>Chapter 36. Extending <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
></H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>36.1. <A
HREF="extend-how.html"
>How Extensibility Works</A
></DT
><DT
>36.2. <A
HREF="extend-type-system.html"
>The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> Type System</A
></DT
><DD
><DL
><DT
>36.2.1. <A
HREF="extend-type-system.html#AEN59959"
>Base Types</A
></DT
><DT
>36.2.2. <A
HREF="extend-type-system.html#AEN59965"
>Composite Types</A
></DT
><DT
>36.2.3. <A
HREF="extend-type-system.html#EXTEND-TYPE-SYSTEM-DOMAINS"
>Domains</A
></DT
><DT
>36.2.4. <A
HREF="extend-type-system.html#AEN59978"
>Pseudo-Types</A
></DT
><DT
>36.2.5. <A
HREF="extend-type-system.html#EXTEND-TYPES-POLYMORPHIC"
>Polymorphic Types</A
></DT
></DL
></DD
><DT
>36.3. <A
HREF="xfunc.html"
>User-defined Functions</A
></DT
><DT
>36.4. <A
HREF="xfunc-sql.html"
>Query Language (<ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
>) Functions</A
></DT
><DD
><DL
><DT
>36.4.1. <A
HREF="xfunc-sql.html#XFUNC-SQL-FUNCTION-ARGUMENTS"
>Arguments for <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions</A
></DT
><DT
>36.4.2. <A
HREF="xfunc-sql.html#XFUNC-SQL-BASE-FUNCTIONS"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions on Base Types</A
></DT
><DT
>36.4.3. <A
HREF="xfunc-sql.html#XFUNC-SQL-COMPOSITE-FUNCTIONS"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions on Composite Types</A
></DT
><DT
>36.4.4. <A
HREF="xfunc-sql.html#XFUNC-OUTPUT-PARAMETERS"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions with Output Parameters</A
></DT
><DT
>36.4.5. <A
HREF="xfunc-sql.html#XFUNC-SQL-VARIADIC-FUNCTIONS"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions with Variable Numbers of Arguments</A
></DT
><DT
>36.4.6. <A
HREF="xfunc-sql.html#XFUNC-SQL-PARAMETER-DEFAULTS"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions with Default Values for Arguments</A
></DT
><DT
>36.4.7. <A
HREF="xfunc-sql.html#XFUNC-SQL-TABLE-FUNCTIONS"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions as Table Sources</A
></DT
><DT
>36.4.8. <A
HREF="xfunc-sql.html#XFUNC-SQL-FUNCTIONS-RETURNING-SET"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions Returning Sets</A
></DT
><DT
>36.4.9. <A
HREF="xfunc-sql.html#XFUNC-SQL-FUNCTIONS-RETURNING-TABLE"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions Returning <TT
CLASS="LITERAL"
>TABLE</TT
></A
></DT
><DT
>36.4.10. <A
HREF="xfunc-sql.html#AEN60368"
>Polymorphic <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions</A
></DT
><DT
>36.4.11. <A
HREF="xfunc-sql.html#AEN60394"
><ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Functions with Collations</A
></DT
></DL
></DD
><DT
>36.5. <A
HREF="xfunc-overload.html"
>Function Overloading</A
></DT
><DT
>36.6. <A
HREF="xfunc-volatility.html"
>Function Volatility Categories</A
></DT
><DT
>36.7. <A
HREF="xfunc-pl.html"
>Procedural Language Functions</A
></DT
><DT
>36.8. <A
HREF="xfunc-internal.html"
>Internal Functions</A
></DT
><DT
>36.9. <A
HREF="xfunc-c.html"
>C-Language Functions</A
></DT
><DD
><DL
><DT
>36.9.1. <A
HREF="xfunc-c.html#XFUNC-C-DYNLOAD"
>Dynamic Loading</A
></DT
><DT
>36.9.2. <A
HREF="xfunc-c.html#XFUNC-C-BASETYPE"
>Base Types in C-Language Functions</A
></DT
><DT
>36.9.3. <A
HREF="xfunc-c.html#AEN60930"
>Version 0 Calling Conventions</A
></DT
><DT
>36.9.4. <A
HREF="xfunc-c.html#AEN60957"
>Version 1 Calling Conventions</A
></DT
><DT
>36.9.5. <A
HREF="xfunc-c.html#AEN61015"
>Writing Code</A
></DT
><DT
>36.9.6. <A
HREF="xfunc-c.html#DFUNC"
>Compiling and Linking Dynamically-loaded Functions</A
></DT
><DT
>36.9.7. <A
HREF="xfunc-c.html#AEN61214"
>Composite-type Arguments</A
></DT
><DT
>36.9.8. <A
HREF="xfunc-c.html#AEN61238"
>Returning Rows (Composite Types)</A
></DT
><DT
>36.9.9. <A
HREF="xfunc-c.html#XFUNC-C-RETURN-SET"
>Returning Sets</A
></DT
><DT
>36.9.10. <A
HREF="xfunc-c.html#AEN61371"
>Polymorphic Arguments and Return Types</A
></DT
><DT
>36.9.11. <A
HREF="xfunc-c.html#XFUNC-TRANSFORM-FUNCTIONS"
>Transform Functions</A
></DT
><DT
>36.9.12. <A
HREF="xfunc-c.html#AEN61422"
>Shared Memory and LWLocks</A
></DT
><DT
>36.9.13. <A
HREF="xfunc-c.html#EXTEND-CPP"
>Using C++ for Extensibility</A
></DT
></DL
></DD
><DT
>36.10. <A
HREF="xaggr.html"
>User-defined Aggregates</A
></DT
><DD
><DL
><DT
>36.10.1. <A
HREF="xaggr.html#XAGGR-MOVING-AGGREGATES"
>Moving-Aggregate Mode</A
></DT
><DT
>36.10.2. <A
HREF="xaggr.html#XAGGR-POLYMORPHIC-AGGREGATES"
>Polymorphic and Variadic Aggregates</A
></DT
><DT
>36.10.3. <A
HREF="xaggr.html#XAGGR-ORDERED-SET-AGGREGATES"
>Ordered-Set Aggregates</A
></DT
><DT
>36.10.4. <A
HREF="xaggr.html#XAGGR-PARTIAL-AGGREGATES"
>Partial Aggregation</A
></DT
><DT
>36.10.5. <A
HREF="xaggr.html#XAGGR-SUPPORT-FUNCTIONS"
>Support Functions for Aggregates</A
></DT
></DL
></DD
><DT
>36.11. <A
HREF="xtypes.html"
>User-defined Types</A
></DT
><DT
>36.12. <A
HREF="xoper.html"
>User-defined Operators</A
></DT
><DT
>36.13. <A
HREF="xoper-optimization.html"
>Operator Optimization Information</A
></DT
><DD
><DL
><DT
>36.13.1. <A
HREF="xoper-optimization.html#AEN61802"
><TT
CLASS="LITERAL"
>COMMUTATOR</TT
></A
></DT
><DT
>36.13.2. <A
HREF="xoper-optimization.html#AEN61837"
><TT
CLASS="LITERAL"
>NEGATOR</TT
></A
></DT
><DT
>36.13.3. <A
HREF="xoper-optimization.html#AEN61853"
><TT
CLASS="LITERAL"
>RESTRICT</TT
></A
></DT
><DT
>36.13.4. <A
HREF="xoper-optimization.html#AEN61903"
><TT
CLASS="LITERAL"
>JOIN</TT
></A
></DT
><DT
>36.13.5. <A
HREF="xoper-optimization.html#AEN61935"
><TT
CLASS="LITERAL"
>HASHES</TT
></A
></DT
><DT
>36.13.6. <A
HREF="xoper-optimization.html#AEN61957"
><TT
CLASS="LITERAL"
>MERGES</TT
></A
></DT
></DL
></DD
><DT
>36.14. <A
HREF="xindex.html"
>Interfacing Extensions To Indexes</A
></DT
><DD
><DL
><DT
>36.14.1. <A
HREF="xindex.html#XINDEX-OPCLASS"
>Index Methods and Operator Classes</A
></DT
><DT
>36.14.2. <A
HREF="xindex.html#XINDEX-STRATEGIES"
>Index Method Strategies</A
></DT
><DT
>36.14.3. <A
HREF="xindex.html#XINDEX-SUPPORT"
>Index Method Support Routines</A
></DT
><DT
>36.14.4. <A
HREF="xindex.html#XINDEX-EXAMPLE"
>An Example</A
></DT
><DT
>36.14.5. <A
HREF="xindex.html#XINDEX-OPFAMILY"
>Operator Classes and Operator Families</A
></DT
><DT
>36.14.6. <A
HREF="xindex.html#XINDEX-OPCLASS-DEPENDENCIES"
>System Dependencies on Operator Classes</A
></DT
><DT
>36.14.7. <A
HREF="xindex.html#XINDEX-ORDERING-OPS"
>Ordering Operators</A
></DT
><DT
>36.14.8. <A
HREF="xindex.html#XINDEX-OPCLASS-FEATURES"
>Special Features of Operator Classes</A
></DT
></DL
></DD
><DT
>36.15. <A
HREF="extend-extensions.html"
>Packaging Related Objects into an Extension</A
></DT
><DD
><DL
><DT
>36.15.1. <A
HREF="extend-extensions.html#AEN62590"
>Extension Files</A
></DT
><DT
>36.15.2. <A
HREF="extend-extensions.html#EXTEND-EXTENSIONS-RELOCATION"
>Extension Relocatability</A
></DT
><DT
>36.15.3. <A
HREF="extend-extensions.html#EXTEND-EXTENSIONS-CONFIG-TABLES"
>Extension Configuration Tables</A
></DT
><DT
>36.15.4. <A
HREF="extend-extensions.html#AEN62785"
>Extension Updates</A
></DT
><DT
>36.15.5. <A
HREF="extend-extensions.html#EXTEND-EXTENSIONS-SECURITY"
>Security Considerations for Extensions</A
></DT
><DT
>36.15.6. <A
HREF="extend-extensions.html#EXTEND-EXTENSIONS-EXAMPLE"
>Extension Example</A
></DT
></DL
></DD
><DT
>36.16. <A
HREF="extend-pgxs.html"
>Extension Building Infrastructure</A
></DT
></DL
></DIV
><P
>   In  the  sections  that follow, we will discuss how you
   can extend the <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
   <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> query language by adding:

   <P
></P
></P><UL
COMPACT="COMPACT"
><LI
STYLE="list-style-type: disc"
><P
>      functions (starting in <A
HREF="xfunc.html"
>Section 36.3</A
>)
     </P
></LI
><LI
STYLE="list-style-type: disc"
><P
>      aggregates (starting in <A
HREF="xaggr.html"
>Section 36.10</A
>)
     </P
></LI
><LI
STYLE="list-style-type: disc"
><P
>      data types (starting in <A
HREF="xtypes.html"
>Section 36.11</A
>)
     </P
></LI
><LI
STYLE="list-style-type: disc"
><P
>      operators (starting in <A
HREF="xoper.html"
>Section 36.12</A
>)
     </P
></LI
><LI
STYLE="list-style-type: disc"
><P
>      operator classes for indexes (starting in <A
HREF="xindex.html"
>Section 36.14</A
>)
     </P
></LI
><LI
STYLE="list-style-type: disc"
><P
>      packages of related objects (starting in <A
HREF="extend-extensions.html"
>Section 36.15</A
>)
     </P
></LI
></UL
><P>
  </P
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