HHH-18150 Fix for Informix float and double precision in decimal digits

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java

@@ -7,6 +7,8 @@
 package org.hibernate.community.dialect;
 
 import org.hibernate.boot.Metadata;
+import java.sql.Types;
+
 import org.hibernate.boot.model.FunctionContributions;
 import org.hibernate.boot.model.TypeContributions;
 import org.hibernate.boot.model.relational.SqlStringGenerationContext;
@@ -27,6 +29,7 @@ import org.hibernate.dialect.sequence.SequenceSupport;
 import org.hibernate.dialect.temptable.TemporaryTable;
 import org.hibernate.dialect.temptable.TemporaryTableKind;
 import org.hibernate.dialect.unique.UniqueDelegate;
+import org.hibernate.engine.jdbc.Size;
 import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
 import org.hibernate.engine.spi.LoadQueryInfluencers;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
@@ -62,6 +65,8 @@ import org.hibernate.sql.exec.spi.JdbcOperation;
 import org.hibernate.tool.schema.extract.spi.SequenceInformationExtractor;
 import org.hibernate.tool.schema.internal.StandardForeignKeyExporter;
 import org.hibernate.tool.schema.spi.Exporter;
+import org.hibernate.type.descriptor.java.JavaType;
+import org.hibernate.type.descriptor.jdbc.JdbcType;
 import org.hibernate.type.descriptor.sql.internal.CapacityDependentDdlType;
 import org.hibernate.type.descriptor.sql.spi.DdlTypeRegistry;
 import org.hibernate.type.spi.TypeConfiguration;
@@ -114,6 +119,24 @@ public class InformixDialect extends Dialect {
 		}
 	};
 
+	private final SizeStrategy sizeStrategy = new SizeStrategyImpl() {
+		@Override
+		public Size resolveSize(
+				JdbcType jdbcType,
+				JavaType<?> javaType,
+				Integer precision,
+				Integer scale,
+				Long length) {
+			switch ( jdbcType.getDdlTypeCode() ) {
+				case Types.FLOAT:
+					// Informix allows FLOAT with a precision up to 16
+					if ( precision != null ) {
+						return Size.precision( Math.min( Math.max( precision, 1 ), 16 ) );
+					}
+			}
+			return super.resolveSize( jdbcType, javaType, precision, scale, length );
+		}
+	};
 	public InformixDialect(DialectResolutionInfo info) {
 		this( info.makeCopyOrDefault( DEFAULT_VERSION ) );
 		registerKeywords( info );
@@ -179,7 +202,7 @@ public class InformixDialect extends Dialect {
 		//double precision.
 		ddlTypeRegistry.addDescriptor(
 				CapacityDependentDdlType.builder( FLOAT, "float($p)", this )
-						.withTypeCapacity( 24, "smallfloat" )
+						.withTypeCapacity( 8, "smallfloat" )
 						.build()
 		);
 
@@ -226,6 +249,21 @@ public class InformixDialect extends Dialect {
 		return 5;
 	}
 
+	@Override
+	public int getFloatPrecision() {
+		return 8;
+	}
+
+	@Override
+	public int getDoublePrecision() {
+		return 16;
+	}
+
+	@Override
+	public SizeStrategy getSizeStrategy() {
+		return sizeStrategy;
+	}
+
 	@Override
 	public void initializeFunctionRegistry(FunctionContributions functionContributions) {
 		super.initializeFunctionRegistry(functionContributions);