gudusoft.gsqlparser.parser

Class HiveSqlParser

Object

gudusoft.gsqlparser.parser.AbstractSqlParser

gudusoft.gsqlparser.parser.HiveSqlParser

All Implemented Interfaces:

SqlParser

public class HiveSqlParser
extends AbstractSqlParser

Apache Hive SQL parser implementation.

This parser handles Hive-specific SQL syntax including:

• Hive DDL statements (CREATE TABLE/DATABASE with Hive-specific options)
• Hive DML statements (INSERT OVERWRITE, LOAD DATA, etc.)
• HiveQL functions and extensions
• Backtick-quoted identifiers including qualified names (`schema.table`)
• Hive-specific keywords and data types

Design Notes:

• Extends AbstractSqlParser using the template method pattern
• Uses TLexerHive for tokenization
• Uses TParserHive for parsing
• Delimiter character: ';' for SQL statements
• Splits backtick-quoted qualified names (`schema.table`) into individual tokens

Usage Example:

 // Get Hive parser from factory
 SqlParser parser = SqlParserFactory.get(EDbVendor.dbvhive);

 // Build context
 ParserContext context = new ParserContext.Builder(EDbVendor.dbvhive)
     .sqlText("SELECT * FROM `default.employee` WHERE dept = 'IT'")
     .build();

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

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

Since:

3.2.0.0

See Also:

SqlParser, AbstractSqlParser, TLexerHive, TParserHive

Nested Class Summary

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

AbstractSqlParser.PreparedSqlReader

Field Summary

Fields

Modifier and Type	Field and Description
TLexerHive	flexer The Hive lexer used for tokenization

Fields inherited from class gudusoft.gsqlparser.parser.AbstractSqlParser

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

Constructor Summary

Constructors

Constructor and Description
HiveSqlParser() Construct Hive SQL parser.

Method Summary

Modifier and Type	Method and Description
protected void	extractVendorRawStatements(SqlParseResult.Builder builder) Call Hive-specific raw statement extraction logic.
protected TCustomLexer	getLexer(ParserContext context) Return the Hive lexer instance.
protected TCustomParser	getParser(ParserContext context, TSourceTokenList tokens) Return the Hive SQL parser instance with updated token list.
protected TCustomParser	getSecondaryParser(ParserContext context, TSourceTokenList tokens) Hive does not use a secondary parser (unlike Oracle with PL/SQL).
protected void	performInterpreter(ParserContext context, TStatementList statements) Perform interpretation/evaluation on statements.
protected TStatementList	performParsing(ParserContext context, TCustomParser parser, TCustomParser secondaryParser, TSourceTokenList tokens, TStatementList rawStatements) Parse all raw SQL statements.
protected void	performSemanticAnalysis(ParserContext context, TStatementList statements) Perform semantic analysis on parsed statements.
protected void	setupVendorParsersForExtraction() Setup Hive parser for raw statement extraction.
protected void	tokenizeVendorSql() Call Hive-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 TLexerHive flexer

The Hive lexer used for tokenization

Constructor Detail

HiveSqlParser

public HiveSqlParser()

Construct Hive SQL parser.

Configures the parser for Hive 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 Hive 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 Hive 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)

Hive does not use a secondary parser (unlike Oracle with PL/SQL).

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 Hive-specific tokenization logic.

Delegates to dohivetexttotokenlist which handles Hive's specific keyword recognition, backtick-quoted identifiers, and qualified name splitting.

Specified by:

tokenizeVendorSql in class AbstractSqlParser

setupVendorParsersForExtraction

protected void setupVendorParsersForExtraction()

Setup Hive parser for raw statement extraction.

Hive 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 Hive-specific raw statement extraction logic.

Delegates to dohivegetrawsqlstatements which handles Hive's statement delimiters (semicolons).

Note: parserContext is already set by AbstractSqlParser before this is called

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)

Parse all raw SQL statements.

This method performs full syntax analysis of each statement:

• Initializes global context and SQL environment
• Parses each statement using TParserHive
• Handles errors with optional error recovery
• Collects syntax errors for reporting

Migrated from TGSqlParser.performParsing()

Specified by:

performParsing in class AbstractSqlParser

Parameters:

context - the parser context

parser - the main parser (TParserHive)

secondaryParser - the secondary parser (null for Hive)

tokens - the source token list

rawStatements - raw statements already extracted (never null)

Returns:

the parsed statement list

performSemanticAnalysis

protected void performSemanticAnalysis(ParserContext context,
                                       TStatementList statements)

Perform semantic analysis on parsed statements.

Runs TSQLResolver to build relationships between tables and columns, resolve references, and perform 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/evaluation on statements.

Runs TASTEvaluator for compile-time constant expression evaluation. Hive does not require interpretation currently.

Overrides:

performInterpreter in class AbstractSqlParser

Parameters:

context - the parser context

statements - the parsed statements (mutable)

toString

public String toString()

Overrides:

toString in class AbstractSqlParser