org.teiid.query.resolver
Class QueryResolver

java.lang.Object
  org.teiid.query.resolver.QueryResolver

public class QueryResolver
extends java.lang.Object

The QueryResolver is used between Parsing and QueryValidation. The SQL queries, inserts, updates and deletes are parsed and converted into objects. The language objects have variable names which resolved to fully qualified names using metadata information. The resolver is also used in transforming the values in language objects to their variable types defined in metadata.

Constructor Summary

QueryResolver()

Method Summary

static Command	expandCommand(ProcedureContainer proc, QueryMetadataInterface metadata, AnalysisRecord analysisRecord)
static java.util.Map<ElementSymbol,Expression>	getVariableValues(Command command, boolean changingOnly, QueryMetadataInterface metadata)
static boolean	isView(GroupSymbol virtualGroup, QueryMetadataInterface qmi)
static boolean	isXMLQuery(Query query, QueryMetadataInterface metadata) Check to verify if the query would return XML results.
static java.util.List<SingleElementSymbol>	parseBindings(QueryNode planNode) Bindings are a poor mans input parameters.
static TempMetadataStore	resolveCommand(Command currentCommand, GroupSymbol container, int type, QueryMetadataInterface metadata) Resolve a command in a given type container and type context.
static TempMetadataStore	resolveCommand(Command command, QueryMetadataInterface metadata) This implements an algorithm to resolve all the symbols created by the parser into real metadata IDs
static TempMetadataStore	resolveCommand(Command currentCommand, QueryMetadataInterface metadata, boolean resolveNullLiterals)
static void	resolveCriteria(Criteria criteria, QueryMetadataInterface metadata) Resolve just a criteria.
static void	resolveSubqueries(Command command, TempMetadataAdapter metadata, java.util.Collection<GroupSymbol> externalGroups)
static QueryNode	resolveView(GroupSymbol virtualGroup, QueryNode qnode, java.lang.String cacheString, QueryMetadataInterface qmi)
static TempMetadataStore	resolveWithBindingMetadata(Command currentCommand, QueryMetadataInterface metadata, QueryNode queryNode, boolean replaceBindings) Bindings are a poor mans input parameters.
static void	setChildMetadata(Command subCommand, Command parent)
static void	setChildMetadata(Command subCommand, java.util.Map parentTempMetadata, GroupContext parentContext)
static void	validateProjectedSymbols(GroupSymbol virtualGroup, java.util.List<ElementSymbol> symbols, java.util.List<SingleElementSymbol> projectedSymbols)
static void	validateProjectedSymbols(GroupSymbol virtualGroup, QueryMetadataInterface qmi, Command result)

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryResolver

public QueryResolver()

Method Detail

expandCommand

public static Command expandCommand(ProcedureContainer proc,
                                    QueryMetadataInterface metadata,
                                    AnalysisRecord analysisRecord)
                             throws QueryResolverException,
                                    QueryMetadataException,
                                    TeiidComponentException

Throws:

QueryResolverException

QueryMetadataException

TeiidComponentException

resolveCommand

public static TempMetadataStore resolveCommand(Command command,
                                               QueryMetadataInterface metadata)
                                        throws QueryResolverException,
                                               TeiidComponentException

This implements an algorithm to resolve all the symbols created by the parser into real metadata IDs

Parameters:

command - Command the SQL command we are running (Select, Update, Insert, Delete)

metadata - QueryMetadataInterface the metadata

Returns:

Throws:

QueryResolverException

TeiidComponentException

resolveCommand

public static TempMetadataStore resolveCommand(Command currentCommand,
                                               GroupSymbol container,
                                               int type,
                                               QueryMetadataInterface metadata)
                                        throws QueryResolverException,
                                               TeiidComponentException

Resolve a command in a given type container and type context.

Parameters:

type - The Command type

Throws:

QueryResolverException

TeiidComponentException

resolveWithBindingMetadata

public static TempMetadataStore resolveWithBindingMetadata(Command currentCommand,
                                                           QueryMetadataInterface metadata,
                                                           QueryNode queryNode,
                                                           boolean replaceBindings)
                                                    throws TeiidComponentException,
                                                           QueryResolverException

Bindings are a poor mans input parameters. They are represented in legacy metadata by ElementSymbols and placed positionally into the command or by alias symbols and matched by names. After resolving bindings will be replaced with their referenced symbols (input names will not be used) and those symbols will be marked as external references.

Throws:

TeiidComponentException

QueryResolverException

parseBindings

public static java.util.List<SingleElementSymbol> parseBindings(QueryNode planNode)
                                                         throws TeiidComponentException

Bindings are a poor mans input parameters. They are represented in legacy metadata by ElementSymbols and placed positionally into the command or by alias symbols and matched by names.

Parameters:

planNode -

Returns:

Throws:

TeiidComponentException

resolveCommand

public static TempMetadataStore resolveCommand(Command currentCommand,
                                               QueryMetadataInterface metadata,
                                               boolean resolveNullLiterals)
                                        throws QueryResolverException,
                                               TeiidComponentException

Throws:

QueryResolverException

TeiidComponentException

isXMLQuery

public static boolean isXMLQuery(Query query,
                                 QueryMetadataInterface metadata)
                          throws TeiidComponentException,
                                 QueryMetadataException,
                                 QueryResolverException

Check to verify if the query would return XML results.

Parameters:

query - the query to check

metadata - QueryMetadataInterface the metadata

Throws:

TeiidComponentException

QueryMetadataException

QueryResolverException

resolveCriteria

public static void resolveCriteria(Criteria criteria,
                                   QueryMetadataInterface metadata)
                            throws QueryResolverException,
                                   QueryMetadataException,
                                   TeiidComponentException

Resolve just a criteria. The criteria will be modified so nothing is returned.

Parameters:

criteria - Criteria to resolve

metadata - Metadata implementation

Throws:

QueryResolverException

QueryMetadataException

TeiidComponentException

setChildMetadata

public static void setChildMetadata(Command subCommand,
                                    Command parent)

setChildMetadata

public static void setChildMetadata(Command subCommand,
                                    java.util.Map parentTempMetadata,
                                    GroupContext parentContext)

getVariableValues

public static java.util.Map<ElementSymbol,Expression> getVariableValues(Command command,
                                                                        boolean changingOnly,
                                                                        QueryMetadataInterface metadata)
                                                                 throws QueryMetadataException,
                                                                        QueryResolverException,
                                                                        TeiidComponentException

Throws:

QueryMetadataException

QueryResolverException

TeiidComponentException

resolveSubqueries

public static void resolveSubqueries(Command command,
                                     TempMetadataAdapter metadata,
                                     java.util.Collection<GroupSymbol> externalGroups)
                              throws QueryResolverException,
                                     TeiidComponentException

Throws:

QueryResolverException

TeiidComponentException

resolveView

public static QueryNode resolveView(GroupSymbol virtualGroup,
                                    QueryNode qnode,
                                    java.lang.String cacheString,
                                    QueryMetadataInterface qmi)
                             throws TeiidComponentException,
                                    QueryMetadataException,
                                    QueryResolverException,
                                    QueryValidatorException

Throws:

TeiidComponentException

QueryMetadataException

QueryResolverException

QueryValidatorException

validateProjectedSymbols

public static void validateProjectedSymbols(GroupSymbol virtualGroup,
                                            QueryMetadataInterface qmi,
                                            Command result)
                                     throws QueryMetadataException,
                                            TeiidComponentException,
                                            QueryValidatorException

Throws:

QueryMetadataException

TeiidComponentException

QueryValidatorException

validateProjectedSymbols

public static void validateProjectedSymbols(GroupSymbol virtualGroup,
                                            java.util.List<ElementSymbol> symbols,
                                            java.util.List<SingleElementSymbol> projectedSymbols)
                                     throws QueryValidatorException

Throws:

QueryValidatorException

isView

public static boolean isView(GroupSymbol virtualGroup,
                             QueryMetadataInterface qmi)
                      throws TeiidComponentException,
                             QueryMetadataException

Throws:

TeiidComponentException

QueryMetadataException