gudusoft.gsqlparser.parser

Class VerticaSqlParser

Object

gudusoft.gsqlparser.parser.AbstractSqlParser

gudusoft.gsqlparser.parser.VerticaSqlParser

All Implemented Interfaces:

SqlParser

public class VerticaSqlParser
extends AbstractSqlParser

Vertica SQL parser implementation.

This parser handles Vertica-specific SQL syntax including:

• Vertica PL/SQL (stored procedures, functions)
• BEGIN/END blocks
• Vertica-specific functions (GREATEST, LEAST, DATE)
• Statement delimiters (semicolon, slash, period)
• IF/CASE/LOOP/FOR/WHILE constructs

Design Notes:

• Extends AbstractSqlParser using the template method pattern
• Uses TLexerVertica for tokenization
• Uses TParserVertica for parsing
• Delimiter character: ';' for SQL statements
• Tokenization delegates to PostgreSQL (Vertica is PostgreSQL-based)

Usage Example:

 // Get Vertica parser from factory
 SqlParser parser = SqlParserFactory.get(EDbVendor.dbvvertica);

 // Build context
 ParserContext context = new ParserContext.Builder(EDbVendor.dbvvertica)
     .sqlText("SELECT * FROM employees WHERE dept_id = 10")
     .build();

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

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

Since:

3.2.0.0

See Also:

SqlParser, AbstractSqlParser, TLexerVertica, TParserVertica

Nested Class Summary

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

AbstractSqlParser.PreparedSqlReader

Field Summary

Fields

Modifier and Type	Field and Description
TLexerVertica	flexer The Vertica 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
VerticaSqlParser() Construct Vertica SQL parser.

Method Summary

Modifier and Type	Method and Description
protected void	extractVendorRawStatements(SqlParseResult.Builder builder) Call Vertica-specific raw statement extraction logic.
protected TCustomLexer	getLexer(ParserContext context) Return the Vertica lexer instance.
protected TCustomParser	getParser(ParserContext context, TSourceTokenList tokens) Return the Vertica SQL parser instance with updated token list.
protected TCustomParser	getSecondaryParser(ParserContext context, TSourceTokenList tokens) Vertica does not use a secondary parser (unlike Oracle with PL/SQL parser).
protected void	performInterpreter(ParserContext context, TStatementList statements) Perform interpretation/evaluation 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 Vertica parser for raw statement extraction.
protected void	tokenizeVendorSql() Call Vertica-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 TLexerVertica flexer

The Vertica lexer used for tokenization

Constructor Detail

VerticaSqlParser

public VerticaSqlParser()

Construct Vertica SQL parser.

Configures the parser for Vertica 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 Vertica 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 Vertica 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)

Vertica does not use a secondary parser (unlike Oracle with 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 Vertica-specific tokenization logic.

Vertica tokenization delegates to PostgreSQL tokenization since Vertica is based on PostgreSQL.

Specified by:

tokenizeVendorSql in class AbstractSqlParser

setupVendorParsersForExtraction

protected void setupVendorParsersForExtraction()

Setup Vertica parser for raw statement extraction.

Vertica 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 Vertica-specific raw statement extraction logic.

Delegates to doverticagetrawsqlstatements which handles Vertica's statement delimiters and PL/SQL block detection.

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.

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/evaluation on parsed statements.

Overrides:

performInterpreter in class AbstractSqlParser

Parameters:

context - the parser context

statements - the parsed statements (mutable)

toString

public String toString()

Overrides:

toString in class AbstractSqlParser