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HHH-17355 Add array_to_string function
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60 changes: 60 additions & 0 deletions
60
hibernate-core/src/main/java/org/hibernate/dialect/function/array/ArrayToStringFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| /* | ||
| * 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.function.array; | ||
|
|
||
| import java.util.List; | ||
|
|
||
| import org.hibernate.query.ReturnableType; | ||
| import org.hibernate.query.sqm.function.AbstractSqmSelfRenderingFunctionDescriptor; | ||
| import org.hibernate.query.sqm.function.FunctionKind; | ||
| import org.hibernate.query.sqm.produce.function.ArgumentTypesValidator; | ||
| import org.hibernate.query.sqm.produce.function.StandardArgumentsValidators; | ||
| import org.hibernate.query.sqm.produce.function.StandardFunctionArgumentTypeResolvers; | ||
| import org.hibernate.query.sqm.produce.function.StandardFunctionReturnTypeResolvers; | ||
| import org.hibernate.sql.ast.SqlAstTranslator; | ||
| import org.hibernate.sql.ast.spi.SqlAppender; | ||
| import org.hibernate.sql.ast.tree.SqlAstNode; | ||
| import org.hibernate.type.StandardBasicTypes; | ||
| import org.hibernate.type.spi.TypeConfiguration; | ||
|
|
||
| import static org.hibernate.query.sqm.produce.function.FunctionParameterType.ANY; | ||
| import static org.hibernate.query.sqm.produce.function.FunctionParameterType.STRING; | ||
|
|
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| /** | ||
| * @author Christian Beikov | ||
| */ | ||
| public class ArrayToStringFunction extends AbstractSqmSelfRenderingFunctionDescriptor { | ||
|
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| public ArrayToStringFunction(TypeConfiguration typeConfiguration) { | ||
| super( | ||
| "array_to_string", | ||
| FunctionKind.NORMAL, | ||
| StandardArgumentsValidators.composite( | ||
| new ArgumentTypesValidator( null, ANY, STRING ), | ||
| ArrayArgumentValidator.DEFAULT_INSTANCE | ||
| ), | ||
| StandardFunctionReturnTypeResolvers.invariant( | ||
| typeConfiguration.getBasicTypeRegistry().resolve( StandardBasicTypes.STRING ) | ||
| ), | ||
| StandardFunctionArgumentTypeResolvers.invariant( typeConfiguration, ANY, STRING ) | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| public void render( | ||
| SqlAppender sqlAppender, | ||
| List<? extends SqlAstNode> sqlAstArguments, | ||
| ReturnableType<?> returnType, | ||
| SqlAstTranslator<?> walker) { | ||
| sqlAppender.appendSql( "array_to_string(" ); | ||
| sqlAstArguments.get( 0 ).accept( walker ); | ||
| sqlAppender.appendSql( ',' ); | ||
| sqlAstArguments.get( 1 ).accept( walker ); | ||
| sqlAppender.appendSql( ')' ); | ||
| } | ||
|
|
||
| } |
52 changes: 52 additions & 0 deletions
52
...nate-core/src/main/java/org/hibernate/dialect/function/array/H2ArrayToStringFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| /* | ||
| * 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.function.array; | ||
|
|
||
| import java.util.List; | ||
|
|
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| import org.hibernate.query.ReturnableType; | ||
| import org.hibernate.sql.ast.SqlAstTranslator; | ||
| import org.hibernate.sql.ast.spi.SqlAppender; | ||
| import org.hibernate.sql.ast.tree.SqlAstNode; | ||
| import org.hibernate.sql.ast.tree.expression.Expression; | ||
| import org.hibernate.type.spi.TypeConfiguration; | ||
|
|
||
| /** | ||
| * H2 requires a very special emulation, because {@code unnest} is pretty much useless, | ||
| * due to https://github.com/h2database/h2database/issues/1815. | ||
| * This emulation uses {@code array_get}, {@code array_length} and {@code system_range} functions to roughly achieve the same. | ||
| */ | ||
| public class H2ArrayToStringFunction extends ArrayToStringFunction { | ||
|
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| private final int maximumArraySize; | ||
|
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| public H2ArrayToStringFunction(int maximumArraySize, TypeConfiguration typeConfiguration) { | ||
| super( typeConfiguration ); | ||
| this.maximumArraySize = maximumArraySize; | ||
| } | ||
|
|
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| @Override | ||
| public void render( | ||
| SqlAppender sqlAppender, | ||
| List<? extends SqlAstNode> sqlAstArguments, | ||
| ReturnableType<?> returnType, | ||
| SqlAstTranslator<?> walker) { | ||
| final Expression arrayExpression = (Expression) sqlAstArguments.get( 0 ); | ||
| final Expression separatorExpression = (Expression) sqlAstArguments.get( 1 ); | ||
| sqlAppender.append( "case when " ); | ||
| arrayExpression.accept( walker ); | ||
| sqlAppender.append( " is not null then coalesce((select listagg(array_get(" ); | ||
| arrayExpression.accept( walker ); | ||
| sqlAppender.append(",i.idx)," ); | ||
| separatorExpression.accept( walker ); | ||
| sqlAppender.append( ") within group (order by i.idx) from system_range(1,"); | ||
| sqlAppender.append( Integer.toString( maximumArraySize ) ); | ||
| sqlAppender.append( ") i(idx) where i.idx<=coalesce(cardinality("); | ||
| arrayExpression.accept( walker ); | ||
| sqlAppender.append("),0)),'') end" ); | ||
| } | ||
| } |
45 changes: 45 additions & 0 deletions
45
...te-core/src/main/java/org/hibernate/dialect/function/array/HSQLArrayToStringFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| * 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.function.array; | ||
|
|
||
| import java.util.List; | ||
|
|
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| import org.hibernate.query.ReturnableType; | ||
| import org.hibernate.sql.ast.SqlAstNodeRenderingMode; | ||
| import org.hibernate.sql.ast.SqlAstTranslator; | ||
| import org.hibernate.sql.ast.spi.SqlAppender; | ||
| import org.hibernate.sql.ast.tree.SqlAstNode; | ||
| import org.hibernate.sql.ast.tree.expression.Expression; | ||
| import org.hibernate.type.spi.TypeConfiguration; | ||
|
|
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| /** | ||
| * HSQLDB has a special syntax. | ||
| */ | ||
| public class HSQLArrayToStringFunction extends ArrayToStringFunction { | ||
|
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| public HSQLArrayToStringFunction(TypeConfiguration typeConfiguration) { | ||
| super( typeConfiguration ); | ||
| } | ||
|
|
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| @Override | ||
| public void render( | ||
| SqlAppender sqlAppender, | ||
| List<? extends SqlAstNode> sqlAstArguments, | ||
| ReturnableType<?> returnType, | ||
| SqlAstTranslator<?> walker) { | ||
| final Expression arrayExpression = (Expression) sqlAstArguments.get( 0 ); | ||
| final Expression separatorExpression = (Expression) sqlAstArguments.get( 1 ); | ||
| sqlAppender.append( "case when " ); | ||
| arrayExpression.accept( walker ); | ||
| sqlAppender.append( " is not null then coalesce((select group_concat(t.val order by t.idx separator " ); | ||
| // HSQLDB doesn't like non-literals as separator | ||
| walker.render( separatorExpression, SqlAstNodeRenderingMode.INLINE_PARAMETERS ); | ||
| sqlAppender.append( ") from unnest("); | ||
| arrayExpression.accept( walker ); | ||
| sqlAppender.append(") with ordinality t(val,idx)),'') end" ); | ||
| } | ||
| } |
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