Chapter 38. Extending SQL

Chapter 38. Extending SQL
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Chapter 38. Extending SQL

Table of Contents

38.1. How Extensibility Works

38.2. The PostgreSQL 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 for SQL 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 Returning TABLE
38.5.10. Polymorphic SQL 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

38.12.1. TOAST Considerations

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

In the sections that follow, we will discuss how you can extend the PostgreSQL SQL query language by adding:

functions (starting in Section 38.3)
aggregates (starting in Section 38.11)
data types (starting in Section 38.12)
operators (starting in Section 38.13)
operator classes for indexes (starting in Section 38.15)
packages of related objects (starting in Section 38.16)

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Part V. Server Programming	Home	38.1. How Extensibility Works