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[#442]: Support LowCardinality series datatype
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115
...ve-jdbc/src/main/java/com/github/housepower/data/type/complex/DataTypeLowCardinality.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package com.github.housepower.data.type.complex; | ||
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| import com.github.housepower.data.DataTypeFactory; | ||
| import com.github.housepower.data.IDataType; | ||
| import com.github.housepower.misc.SQLLexer; | ||
| import com.github.housepower.misc.Validate; | ||
| import com.github.housepower.serde.BinaryDeserializer; | ||
| import com.github.housepower.serde.BinarySerializer; | ||
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| import java.io.IOException; | ||
| import java.sql.SQLException; | ||
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| public class DataTypeLowCardinality implements IDataType { | ||
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| public static DataTypeCreator creator = (lexer, serverContext) -> { | ||
| Validate.isTrue(lexer.character() == '('); | ||
| IDataType nestedType = DataTypeFactory.get(lexer, serverContext); | ||
| Validate.isTrue(lexer.character() == ')'); | ||
| return new DataTypeLowCardinality( | ||
| "LowCardinality(" + nestedType.name() + ")", nestedType); | ||
| }; | ||
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| private final String name; | ||
| private final IDataType nestedDataType; | ||
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| public DataTypeLowCardinality(String name, IDataType nestedDataType) { | ||
| this.name = name; | ||
| this.nestedDataType = nestedDataType; | ||
| } | ||
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| @Override | ||
| public String name() { | ||
| return this.name; | ||
| } | ||
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| @Override | ||
| public int sqlTypeId() { | ||
| return this.nestedDataType.sqlTypeId(); | ||
| } | ||
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| @Override | ||
| public Object defaultValue() { | ||
| return this.nestedDataType.defaultValue(); | ||
| } | ||
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| @Override | ||
| public Class javaType() { | ||
| return this.nestedDataType.javaType(); | ||
| } | ||
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| @Override | ||
| public Class jdbcJavaType() { | ||
| return this.nestedDataType.jdbcJavaType(); | ||
| } | ||
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| @Override | ||
| public boolean nullable() { | ||
| return this.nestedDataType.nullable(); | ||
| } | ||
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| @Override | ||
| public int getPrecision() { | ||
| return this.nestedDataType.getPrecision(); | ||
| } | ||
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| @Override | ||
| public int getScale() { | ||
| return this.nestedDataType.getScale(); | ||
| } | ||
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| @Override | ||
| public Object deserializeText(SQLLexer lexer) throws SQLException { | ||
| return this.nestedDataType.deserializeText(lexer); | ||
| } | ||
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| @Override | ||
| public void serializeBinary(Object data, BinarySerializer serializer) throws SQLException, IOException { | ||
| this.nestedDataType.serializeBinary(data, serializer); | ||
| } | ||
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| @Override | ||
| public void serializeBinaryBulk(Object[] data, BinarySerializer serializer) throws SQLException, IOException { | ||
| this.nestedDataType.serializeBinaryBulk(data, serializer); | ||
| } | ||
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| @Override | ||
| public Object deserializeBinary(BinaryDeserializer deserializer) throws SQLException, IOException { | ||
| return this.nestedDataType.deserializeBinary(deserializer); | ||
| } | ||
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| @Override | ||
| public Object[] deserializeBinaryBulk(int rows, BinaryDeserializer deserializer) throws SQLException, IOException { | ||
| Object[] data = this.nestedDataType.deserializeBinaryBulk(rows, deserializer); | ||
| return data; | ||
| } | ||
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| @Override | ||
| public boolean isSigned() { | ||
| return this.nestedDataType.isSigned(); | ||
| } | ||
| } |
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114 changes: 114 additions & 0 deletions
114
clickhouse-native-jdbc/src/test/java/com/github/housepower/jdbc/LowCardinalityTypeTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package com.github.housepower.jdbc; | ||
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| import com.github.housepower.misc.BytesHelper; | ||
| import org.junit.jupiter.api.Test; | ||
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| import java.sql.*; | ||
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| import static org.junit.jupiter.api.Assertions.*; | ||
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| //Refer to [[https://github.com/housepower/ClickHouse-Native-JDBC/issues/442]] for more details. | ||
| public class LowCardinalityTypeTest extends AbstractITest implements BytesHelper { | ||
| @Test | ||
| public void testAllLowCardinalityTypes() throws Exception { | ||
| withStatement(statement -> { | ||
| statement.execute("DROP TABLE IF EXISTS low_cardinality_test"); | ||
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| StringBuilder createTableSQL = new StringBuilder(); | ||
| createTableSQL.append("CREATE TABLE IF NOT EXISTS low_cardinality_test (") | ||
| .append("value_string LowCardinality(String), ") | ||
| .append("fixed_string LowCardinality(FixedString(10)), ") | ||
| .append("date_value LowCardinality(Nullable(Date)), ") | ||
| .append("datetime_value LowCardinality(Nullable(DateTime)), ") | ||
| .append("number_value LowCardinality(Nullable(Int32))) Engine=Memory()"); | ||
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| statement.execute(createTableSQL.toString()); | ||
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| String sql = "INSERT INTO low_cardinality_test " + | ||
| "(value_string, fixed_string, date_value, datetime_value, number_value) values(?, ?, ?, ?, ?);"; | ||
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| try (PreparedStatement pstmt = statement.getConnection().prepareStatement(sql)) { | ||
| for (int i = 0; i < 300; i++) { | ||
| pstmt.setString(1, "test"); | ||
| pstmt.setString(2, "abcdefghij"); | ||
| if (i % 50 == 0) { | ||
| pstmt.setNull(3, Types.DATE); | ||
| pstmt.setNull(4, Types.TIMESTAMP); | ||
| pstmt.setNull(5, Types.INTEGER); | ||
| } else { | ||
| pstmt.setDate(3, new java.sql.Date(System.currentTimeMillis())); | ||
| pstmt.setTimestamp(4, new java.sql.Timestamp(System.currentTimeMillis())); | ||
| pstmt.setInt(5, i); | ||
| } | ||
| pstmt.addBatch(); | ||
| } | ||
| pstmt.executeBatch(); | ||
| } | ||
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| DatabaseMetaData metaData = statement.getConnection().getMetaData(); | ||
| ResultSet columns = metaData.getColumns(null, "default", "low_cardinality_test", "%"); | ||
| while (columns.next()) { | ||
| String columnName = columns.getString("COLUMN_NAME"); | ||
| String columnType = columns.getString("TYPE_NAME"); | ||
| switch (columnName) { | ||
| case "value_string": | ||
| assertEquals(columnType, "LowCardinality(String)"); | ||
| break; | ||
| case "fixed_string": | ||
| assertEquals(columnType, "LowCardinality(FixedString(10))"); | ||
| break; | ||
| case "date_value": | ||
| assertEquals(columnType, "LowCardinality(Nullable(Date))"); | ||
| break; | ||
| case "datetime_value": | ||
| assertEquals(columnType, "LowCardinality(Nullable(DateTime))"); | ||
| break; | ||
| case "number_value": | ||
| assertEquals(columnType, "LowCardinality(Nullable(Int32))"); | ||
| break; | ||
| } | ||
| } | ||
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| ResultSet rs = statement.executeQuery("SELECT * FROM low_cardinality_test;"); | ||
| int size = 0; | ||
| while (rs.next()) { | ||
| String valueStr = rs.getString("value_string"); | ||
| String fixedStr = rs.getString("fixed_string"); | ||
| Date dateValue = rs.getDate("date_value"); | ||
| Timestamp datetimeValue = rs.getTimestamp("datetime_value"); | ||
| Integer numberValue = (Integer) rs.getObject("number_value"); | ||
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| assertEquals("test", valueStr); | ||
| assertEquals("abcdefghij", fixedStr); | ||
| if (size % 50 == 0) { | ||
| assertNull(dateValue); | ||
| assertNull(datetimeValue); | ||
| assertNull(numberValue); | ||
| } else { | ||
| assertNotNull(dateValue); | ||
| assertNotNull(datetimeValue); | ||
| assertTrue(numberValue >= 0 && numberValue < 300); | ||
| } | ||
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| size++; | ||
| } | ||
| assertEquals(300, size); | ||
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| statement.execute("DROP TABLE IF EXISTS low_cardinality_test"); | ||
| }, "allow_suspicious_low_cardinality_types", "1"); | ||
| } | ||
| } |