gudusoft.gsqlparser.parser

Class RedshiftSqlParser

Object

gudusoft.gsqlparser.parser.AbstractSqlParser

gudusoft.gsqlparser.parser.RedshiftSqlParser

All Implemented Interfaces:

SqlParser

public class RedshiftSqlParser
extends AbstractSqlParser

Amazon Redshift SQL parser implementation.

This parser handles Redshift-specific SQL syntax including:

• PostgreSQL-based syntax (Redshift is based on PostgreSQL 8.0.2)
• PL/pgSQL functions and procedures
• CREATE FUNCTION with LANGUAGE clause
• Function body delimiters ($$)
• Redshift-specific types (ARRAY<type>, %ROWTYPE, etc.)
• Redshift-specific keywords (FILTER, LANGUAGE, etc.)

Design Notes:

• Extends AbstractSqlParser using the template method pattern
• Uses TLexerRedshift for tokenization
• Uses TParserRedshift for parsing
• Delimiter character: ';' for SQL statements

Usage Example:

 // Get Redshift parser from factory
 SqlParser parser = SqlParserFactory.get(EDbVendor.dbvredshift);

 // Build context
 ParserContext context = new ParserContext.Builder(EDbVendor.dbvredshift)
     .sqlText("SELECT * FROM orders WHERE order_date > CURRENT_DATE - 7")
     .build();

 // Parse
 SqlParseResult result = parser.parse(context);

 // Access statements
 TStatementList statements = result.getSqlStatements();
 

Since:

3.2.0.0

See Also:

SqlParser, AbstractSqlParser, TLexerRedshift, TParserRedshift

Nested Class Summary

Nested classes/interfaces inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

AbstractSqlParser.PreparedSqlReader

Field Summary

Fields

Modifier and Type	Field and Description
TLexerRedshift	flexer The Redshift lexer used for tokenization

Fields inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

defaultDelimiterStr, delimiterChar, frameStack, globalContext, globalFrame, lexer, parserContext, sourcetokenlist, sqlcmds, sqlEnv, sqlstatements, syntaxErrors, vendor

Constructor Summary

Constructors

Constructor and Description
RedshiftSqlParser() Construct Redshift SQL parser.

Method Summary

Modifier and Type	Method and Description
protected void	extractVendorRawStatements(SqlParseResult.Builder builder) Call Redshift-specific raw statement extraction logic.
protected TCustomLexer	getLexer(ParserContext context) Return the Redshift lexer instance.
protected TCustomParser	getParser(ParserContext context, TSourceTokenList tokens) Return the Redshift SQL parser instance with updated token list.
protected TCustomParser	getSecondaryParser(ParserContext context, TSourceTokenList tokens) Redshift doesn't have a secondary parser.
protected void	performInterpreter(ParserContext context, TStatementList statements) Perform interpretation on parsed statements.
protected TStatementList	performParsing(ParserContext context, TCustomParser parser, TCustomParser secondaryParser, TSourceTokenList tokens, TStatementList rawStatements) Perform full parsing of statements with syntax checking.
protected void	performSemanticAnalysis(ParserContext context, TStatementList statements) Perform semantic analysis on parsed statements.
protected void	setupVendorParsersForExtraction() Setup Redshift parser for raw statement extraction.
protected void	tokenizeVendorSql() Call Redshift-specific tokenization logic.
String	toString()

Methods inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

afterStatementParsed, attemptErrorRecovery, copyErrorsFromStatement, doAfterTokenize, doExtractRawStatements, extractRawStatements, getanewsourcetoken, getDefaultDelimiterStr, getDelimiterChar, getErrorCount, getrawsqlstatements, getSyntaxErrors, getVendor, handleStatementParsingException, initializeGlobalContext, isDollarFunctionDelimiter, onRawStatementComplete, onRawStatementCompleteVendorSpecific, parse, performTokenization, prepareSqlReader, processTokensBeforeParse, processTokensInTokenTable, setTokenHandle, tokenize, towinlinebreak

Methods inherited from class Object

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

Field Detail

flexer

public TLexerRedshift flexer

The Redshift lexer used for tokenization

Constructor Detail

RedshiftSqlParser

public RedshiftSqlParser()

Construct Redshift SQL parser.

Configures the parser for Redshift database with default delimiter (;).

Following the original TGSqlParser pattern, the lexer and parser are created once in the constructor and reused for all parsing operations.

Method Detail

getLexer

protected TCustomLexer getLexer(ParserContext context)

Return the Redshift lexer instance.

Specified by:

getLexer in class AbstractSqlParser

Parameters:

context - the parser context

Returns:

configured lexer instance (never null)

getParser

protected TCustomParser getParser(ParserContext context,
                                  TSourceTokenList tokens)

Return the Redshift SQL parser instance with updated token list.

Specified by:

getParser in class AbstractSqlParser

Parameters:

context - the parser context

tokens - the source token list

Returns:

configured parser instance (never null)

getSecondaryParser

protected TCustomParser getSecondaryParser(ParserContext context,
                                           TSourceTokenList tokens)

Redshift doesn't have a secondary parser.

Only Oracle uses a secondary parser (PL/SQL parser).

Overrides:

getSecondaryParser in class AbstractSqlParser

Parameters:

context - the parser context

tokens - the source token list

Returns:

secondary parser instance, or null if not needed

tokenizeVendorSql

protected void tokenizeVendorSql()

Call Redshift-specific tokenization logic.

Delegates to doredshiftsqltexttotokenlist which handles Redshift's specific keyword recognition, PostgreSQL commands, and token generation.

Specified by:

tokenizeVendorSql in class AbstractSqlParser

setupVendorParsersForExtraction

protected void setupVendorParsersForExtraction()

Setup Redshift parser for raw statement extraction.

Redshift uses a single parser, so we inject sqlcmds and update the token list for the main parser only.

Specified by:

setupVendorParsersForExtraction in class AbstractSqlParser

extractVendorRawStatements

protected void extractVendorRawStatements(SqlParseResult.Builder builder)

Call Redshift-specific raw statement extraction logic.

Delegates to doredshiftgetrawsqlstatements which handles Redshift's statement delimiters (semicolon, function delimiters $$, etc.).

Specified by:

extractVendorRawStatements in class AbstractSqlParser

Parameters:

builder - the result builder to populate with raw statements

performParsing

protected TStatementList performParsing(ParserContext context,
                                        TCustomParser parser,
                                        TCustomParser secondaryParser,
                                        TSourceTokenList tokens,
                                        TStatementList rawStatements)

Perform full parsing of statements with syntax checking.

This method orchestrates the parsing of all statements.

Specified by:

performParsing in class AbstractSqlParser

Parameters:

context - the parser context

parser - the main parser instance

secondaryParser - secondary parser (may be null)

tokens - the source token list

rawStatements - raw statements already extracted (never null)

Returns:

statement list with parsed AST (never null)

performSemanticAnalysis

protected void performSemanticAnalysis(ParserContext context,
                                       TStatementList statements)

Perform semantic analysis on parsed statements.

This step resolves column-to-table relationships and performs type checking.

Overrides:

performSemanticAnalysis in class AbstractSqlParser

Parameters:

context - the parser context

statements - the parsed statements (mutable)

performInterpreter

protected void performInterpreter(ParserContext context,
                                  TStatementList statements)

Perform interpretation on parsed statements.

This step evaluates constant expressions and performs other interpretation tasks.

Overrides:

performInterpreter in class AbstractSqlParser

Parameters:

context - the parser context

statements - the parsed statements (mutable)

toString

public String toString()

Overrides:

toString in class AbstractSqlParser