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Table of Contents

38.1. How Extensibility Works

38.2. ThePostgreSQL Type System

38.2.1. Base Types

38.2.2. Container Types

38.2.3. Domains

38.2.4. Pseudo-Types

38.2.5. Polymorphic Types

38.3. User-defined Functions

38.4. User-defined Procedures

38.5. Query Language (SQL) Functions

38.5.1. Arguments forSQL Functions

38.5.2.SQL Functions on Base Types

38.5.3.SQL Functions on Composite Types

38.5.4.SQL Functions with Output Parameters

38.5.5.SQL Functions with Variable Numbers of Arguments

38.5.6.SQL Functions with Default Values for Arguments

38.5.7.SQL Functions as Table Sources

38.5.8.SQL Functions Returning Sets

38.5.9.SQL Functions ReturningTABLE

38.5.10. PolymorphicSQL Functions

38.5.11.SQL Functions with Collations

38.6. Function Overloading

38.7. Function Volatility Categories

38.8. Procedural Language Functions

38.9. Internal Functions

38.10. C-Language Functions

38.10.1. Dynamic Loading

38.10.2. Base Types in C-Language Functions

38.10.3. Version 1 Calling Conventions

38.10.4. Writing Code

38.10.5. Compiling and Linking Dynamically-loaded Functions

38.10.6. Composite-type Arguments

38.10.7. Returning Rows (Composite Types)

38.10.8. Returning Sets

38.10.9. Polymorphic Arguments and Return Types

38.10.10. Transform Functions

38.10.11. Shared Memory and LWLocks

38.10.12. Using C++ for Extensibility

38.11. User-defined Aggregates

38.11.1. Moving-Aggregate Mode

38.11.2. Polymorphic and Variadic Aggregates

38.11.3. Ordered-Set Aggregates

38.11.4. Partial Aggregation

38.11.5. Support Functions for Aggregates

38.12. User-defined Types

38.13. User-defined Operators

38.14. Operator Optimization Information

38.14.1.COMMUTATOR

38.14.2.NEGATOR

38.14.3.RESTRICT

38.14.4.JOIN

38.14.5.HASHES

38.14.6.MERGES

38.15. Interfacing Extensions To Indexes

38.15.1. Index Methods and Operator Classes

38.15.2. Index Method Strategies

38.15.3. Index Method Support Routines

38.15.4. An Example

38.15.5. Operator Classes and Operator Families

38.15.6. System Dependencies on Operator Classes

38.15.7. Ordering Operators

38.15.8. Special Features of Operator Classes

38.16. Packaging Related Objects into an Extension

38.16.1. Extension Files

38.16.2. Extension Relocatability

38.16.3. Extension Configuration Tables

38.16.4. Extension Updates

38.16.5. Installing Extensions using Update Scripts

38.16.6. Security Considerations for Extensions

38.16.7. Extension Example

38.17. Extension Building Infrastructure

• functions (starting inSection 38.3)

• aggregates (starting inSection 38.11)

• data types (starting inSection 38.12)

• operators (starting inSection 38.13)

• operator classes for indexes (starting inSection 38.15)

• packages of related objects (starting inSection 38.16)