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HANASqlAstTranslator.java
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HANASqlAstTranslator.java
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
*/
package org.hibernate.dialect;
import java.util.List;
import org.hibernate.MappingException;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.util.collections.Stack;
import org.hibernate.query.IllegalQueryOperationException;
import org.hibernate.query.sqm.ComparisonOperator;
import org.hibernate.sql.ast.Clause;
import org.hibernate.sql.ast.SqlAstNodeRenderingMode;
import org.hibernate.sql.ast.spi.AbstractSqlAstTranslator;
import org.hibernate.sql.ast.tree.Statement;
import org.hibernate.sql.ast.tree.cte.CteStatement;
import org.hibernate.sql.ast.tree.expression.BinaryArithmeticExpression;
import org.hibernate.sql.ast.tree.expression.Expression;
import org.hibernate.sql.ast.tree.expression.Literal;
import org.hibernate.sql.ast.tree.expression.Summarization;
import org.hibernate.sql.ast.tree.from.FunctionTableReference;
import org.hibernate.sql.ast.tree.from.NamedTableReference;
import org.hibernate.sql.ast.tree.from.QueryPartTableReference;
import org.hibernate.sql.ast.tree.from.ValuesTableReference;
import org.hibernate.sql.ast.tree.insert.ConflictClause;
import org.hibernate.sql.ast.tree.insert.InsertSelectStatement;
import org.hibernate.sql.ast.tree.insert.Values;
import org.hibernate.sql.ast.tree.select.QueryGroup;
import org.hibernate.sql.ast.tree.select.QueryPart;
import org.hibernate.sql.ast.tree.select.QuerySpec;
import org.hibernate.sql.ast.tree.update.UpdateStatement;
import org.hibernate.sql.exec.spi.JdbcOperation;
import org.hibernate.sql.model.internal.TableInsertStandard;
/**
* A SQL AST translator for HANA.
*
* @author Christian Beikov
*/
public class HANASqlAstTranslator<T extends JdbcOperation> extends AbstractSqlAstTranslator<T> {
private boolean inLateral;
public HANASqlAstTranslator(SessionFactoryImplementor sessionFactory, Statement statement) {
super( sessionFactory, statement );
}
@Override
public void visitBinaryArithmeticExpression(BinaryArithmeticExpression arithmeticExpression) {
if ( isIntegerDivisionEmulationRequired( arithmeticExpression ) ) {
appendSql( "cast(" );
visitArithmeticOperand( arithmeticExpression.getLeftHandOperand() );
appendSql( arithmeticExpression.getOperator().getOperatorSqlTextString() );
visitArithmeticOperand( arithmeticExpression.getRightHandOperand() );
appendSql( " as int)" );
}
else {
super.visitBinaryArithmeticExpression( arithmeticExpression );
}
}
@SuppressWarnings("removal")
private boolean isHanaCloud() {
return ( (AbstractHANADialect) getDialect() ).isCloud();
}
@Override
protected void visitInsertStatementOnly(InsertSelectStatement statement) {
if ( statement.getConflictClause() == null || statement.getConflictClause().isDoNothing() ) {
// Render plain insert statement and possibly run into unique constraint violation
super.visitInsertStatementOnly( statement );
}
else {
visitInsertStatementEmulateMerge( statement );
}
}
@Override
protected void visitUpdateStatementOnly(UpdateStatement statement) {
// HANA Cloud does not support the FROM clause in UPDATE statements
if ( isHanaCloud() && hasNonTrivialFromClause( statement.getFromClause() ) ) {
visitUpdateStatementEmulateMerge( statement );
}
else {
super.visitUpdateStatementOnly( statement );
}
}
@Override
protected void renderUpdateClause(UpdateStatement updateStatement) {
// HANA Cloud does not support the FROM clause in UPDATE statements
if ( isHanaCloud() ) {
super.renderUpdateClause( updateStatement );
}
else {
appendSql( "update" );
final Stack<Clause> clauseStack = getClauseStack();
try {
clauseStack.push( Clause.UPDATE );
renderTableReferenceIdentificationVariable( updateStatement.getTargetTable() );
}
finally {
clauseStack.pop();
}
}
}
@Override
protected void renderFromClauseAfterUpdateSet(UpdateStatement statement) {
// HANA Cloud does not support the FROM clause in UPDATE statements
if ( !isHanaCloud() ) {
if ( statement.getFromClause().getRoots().isEmpty() ) {
appendSql( " from " );
renderDmlTargetTableExpression( statement.getTargetTable() );
}
else {
visitFromClause( statement.getFromClause() );
}
}
}
@Override
protected void renderDmlTargetTableExpression(NamedTableReference tableReference) {
super.renderDmlTargetTableExpression( tableReference );
if ( getClauseStack().getCurrent() != Clause.INSERT ) {
renderTableReferenceIdentificationVariable( tableReference );
}
}
@Override
protected void visitConflictClause(ConflictClause conflictClause) {
if ( conflictClause != null ) {
if ( conflictClause.isDoUpdate() && conflictClause.getConstraintName() != null ) {
throw new IllegalQueryOperationException( "Insert conflict 'do update' clause with constraint name is not supported" );
}
}
}
protected boolean shouldEmulateFetchClause(QueryPart queryPart) {
// HANA only supports the LIMIT + OFFSET syntax but also window functions
// Check if current query part is already row numbering to avoid infinite recursion
return useOffsetFetchClause( queryPart ) && getQueryPartForRowNumbering() != queryPart
&& !isRowsOnlyFetchClauseType( queryPart );
}
@Override
protected boolean supportsWithClauseInSubquery() {
// HANA doesn't seem to support correlation, so we just report false here for simplicity
return false;
}
@Override
protected boolean isCorrelated(CteStatement cteStatement) {
// Report false here, because apparently HANA does not need the "lateral" keyword to correlate a from clause subquery in a subquery
return false;
}
@Override
public void visitQueryGroup(QueryGroup queryGroup) {
if ( shouldEmulateFetchClause( queryGroup ) ) {
emulateFetchOffsetWithWindowFunctions( queryGroup, true );
}
else {
super.visitQueryGroup( queryGroup );
}
}
@Override
public void visitQuerySpec(QuerySpec querySpec) {
if ( shouldEmulateFetchClause( querySpec ) ) {
emulateFetchOffsetWithWindowFunctions( querySpec, true );
}
else {
super.visitQuerySpec( querySpec );
}
}
@Override
public void visitQueryPartTableReference(QueryPartTableReference tableReference) {
if ( tableReference.isLateral() && !inLateral ) {
inLateral = true;
emulateQueryPartTableReferenceColumnAliasing( tableReference );
inLateral = false;
}
else {
emulateQueryPartTableReferenceColumnAliasing( tableReference );
}
}
@Override
protected SqlAstNodeRenderingMode getParameterRenderingMode() {
// HANA does not support parameters in lateral subqueries for some reason, so inline all the parameters in this case
return inLateral ? SqlAstNodeRenderingMode.INLINE_ALL_PARAMETERS : super.getParameterRenderingMode();
}
@Override
public void visitFunctionTableReference(FunctionTableReference tableReference) {
tableReference.getFunctionExpression().accept( this );
renderTableReferenceIdentificationVariable( tableReference );
}
@Override
public void visitOffsetFetchClause(QueryPart queryPart) {
if ( !isRowNumberingCurrentQueryPart() ) {
renderLimitOffsetClause( queryPart );
}
}
@Override
protected void renderComparison(Expression lhs, ComparisonOperator operator, Expression rhs) {
renderComparisonEmulateIntersect( lhs, operator, rhs );
}
@Override
protected void renderPartitionItem(Expression expression) {
if ( expression instanceof Literal ) {
appendSql( "grouping sets (())" );
}
else if ( expression instanceof Summarization ) {
throw new UnsupportedOperationException( "Summarization is not supported by DBMS" );
}
else {
expression.accept( this );
}
}
@Override
protected boolean supportsRowValueConstructorSyntaxInQuantifiedPredicates() {
return false;
}
@Override
protected boolean supportsRowValueConstructorGtLtSyntax() {
return false;
}
@Override
protected String getDual() {
return "sys.dummy";
}
@Override
protected String getFromDualForSelectOnly() {
return " from " + getDual();
}
@Override
protected void renderInsertIntoNoColumns(TableInsertStandard tableInsert) {
throw new MappingException(
String.format(
"The INSERT statement for table [%s] contains no column, and this is not supported by [%s]",
tableInsert.getMutatingTable().getTableId(),
getDialect()
)
);
}
@Override
protected void visitValuesList(List<Values> valuesList) {
visitValuesListEmulateSelectUnion( valuesList );
}
@Override
public void visitValuesTableReference(ValuesTableReference tableReference) {
emulateValuesTableReferenceColumnAliasing( tableReference );
}
}