Extending SQL
- Table of Contents
- 35.1. How Extensibility Works
- 35.2. The PostgreSQL Type System
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- 35.2.1. Base Types
- 35.2.2. Composite Types
- 35.2.3. Domains
- 35.2.4. Pseudo-Types
- 35.2.5. Polymorphic Types
- 35.3. User-defined Functions
- 35.4. Query Language ( SQL ) Functions
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- 35.4.1. Arguments for SQL Functions
- 35.4.2. SQL Functions on Base Types
- 35.4.3. SQL Functions on Composite Types
- 35.4.4. SQL Functions with Output Parameters
- 35.4.5. SQL Functions with Variable Numbers of Arguments
- 35.4.6. SQL Functions with Default Values for Arguments
- 35.4.7. SQL Functions as Table Sources
- 35.4.8. SQL Functions Returning Sets
- 35.4.9. SQL Functions Returning TABLE
- 35.4.10. Polymorphic SQL Functions
- 35.4.11. SQL Functions with Collations
- 35.5. Function Overloading
- 35.6. Function Volatility Categories
- 35.7. Procedural Language Functions
- 35.8. Internal Functions
- 35.9. C-Language Functions
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- 35.9.1. Dynamic Loading
- 35.9.2. Base Types in C-Language Functions
- 35.9.3. Version 0 Calling Conventions
- 35.9.4. Version 1 Calling Conventions
- 35.9.5. Writing Code
- 35.9.6. Compiling and Linking Dynamically-loaded Functions
- 35.9.7. Composite-type Arguments
- 35.9.8. Returning Rows (Composite Types)
- 35.9.9. Returning Sets
- 35.9.10. Polymorphic Arguments and Return Types
- 35.9.11. Transform Functions
- 35.9.12. Shared Memory and LWLocks
- 35.9.13. Using C++ for Extensibility
- 35.10. User-defined Aggregates
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- 35.10.1. Moving-Aggregate Mode
- 35.10.2. Polymorphic and Variadic Aggregates
- 35.10.3. Ordered-Set Aggregates
- 35.10.4. Support Functions for Aggregates
- 35.11. User-defined Types
- 35.12. User-defined Operators
- 35.13. Operator Optimization Information
- 35.14. Interfacing Extensions To Indexes
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- 35.14.1. Index Methods and Operator Classes
- 35.14.2. Index Method Strategies
- 35.14.3. Index Method Support Routines
- 35.14.4. An Example
- 35.14.5. Operator Classes and Operator Families
- 35.14.6. System Dependencies on Operator Classes
- 35.14.7. Ordering Operators
- 35.14.8. Special Features of Operator Classes
- 35.15. Packaging Related Objects into an Extension
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- 35.15.1. Defining Extension Objects
- 35.15.2. Extension Files
- 35.15.3. Extension Relocatability
- 35.15.4. Extension Configuration Tables
- 35.15.5. Extension Updates
- 35.15.6. Extension Example
- 35.16. Extension Building Infrastructure
In the sections that follow, we will discuss how you can extend the PostgreSQL SQL query language by adding:
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functions (starting in Section 35.3 )
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aggregates (starting in Section 35.10 )
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data types (starting in Section 35.11 )
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operators (starting in Section 35.12 )
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operator classes for indexes (starting in Section 35.14 )
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packages of related objects (starting in Section 35.15 )