gudusoft.gsqlparser.resolver

Class TMetadataCollector

Object

gudusoft.gsqlparser.nodes.TParseTreeVisitor

gudusoft.gsqlparser.resolver.TMetadataCollector

public class TMetadataCollector
extends TParseTreeVisitor

TMetadataCollector is responsible for collecting metadata information from SQL statements, particularly focusing on table and function definitions. It traverses the parse tree and builds up metadata in the global scope.

Constructor Summary

Constructors

Constructor and Description
TMetadataCollector(TStatementList sqls, gudusoft.gsqlparser.compiler.TContext context) Constructor for TMetadataCollector.

Method Summary

Modifier and Type	Method and Description
void	collect() Main method to start metadata collection process.
void	preVisit(TCreateFunctionStmt stmt) Processes CREATE FUNCTION statements to collect function metadata.
void	preVisit(TCreateTableSqlStatement stmt) Processes CREATE TABLE statements to collect table metadata.

Methods inherited from class gudusoft.gsqlparser.nodes.TParseTreeVisitor

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Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TMetadataCollector

public TMetadataCollector(TStatementList sqls,
                          gudusoft.gsqlparser.compiler.TContext context)

Constructor for TMetadataCollector. Initializes the collector with a list of SQL statements and a global context.

Parameters:

sqls - List of SQL statements to analyze

context - Global context that will store collected metadata

Method Detail

collect

public void collect()

Main method to start metadata collection process. Iterates through all SQL statements and collects metadata from each one. This includes: - Table definitions from CREATE TABLE statements - Function definitions from CREATE FUNCTION statements - Other metadata from various SQL statements

preVisit

public void preVisit(TCreateTableSqlStatement stmt)

Processes CREATE TABLE statements to collect table metadata. Handles both regular table creation and CREATE TABLE AS SELECT.

Overrides:

preVisit in class TParseTreeVisitor

Parameters:

stmt - The CREATE TABLE statement to process Actions performed: 1. Creates new table entry in SQL environment 2. Sets table name and resolves it 3. Processes column definitions 4. Handles subquery-based table creation

preVisit

public void preVisit(TCreateFunctionStmt stmt)

Processes CREATE FUNCTION statements to collect function metadata. Captures function name, parameters, and return type information.

Overrides:

preVisit in class TParseTreeVisitor

Parameters:

stmt - The CREATE FUNCTION statement to process Actions performed: 1. Creates new function entry in SQL environment 2. Processes function parameters 3. Sets function return type