Calcite应用介绍 - Apache Calcite教程-SQL解析-Calcite自定义语法解析 - 《大数据相关知识》

Calcite自定义SQL解析常用方法和配置
config.fmpp
配置和Parser.jj文件结合说明
package,class,imports
keywords
nonReservedKeywords
joinTypes
statementParserMethods
literalParserMethods
dataTypeParserMethods
alterStatementParserMethods
createStatementParserMethods
dropStatementParserMethods
implementationFiles
includeCompoundIdentifier
includeBraces
includeAdditionalDeclarations
Parser.jj常用方法
getPos()
StringLiteral
Identifier
SimpleIdentifier
CompoundIdentifier
更多示例代码
其他常见类
自定义SQL
自定义SQL语法
定义解析结果类
语法模板 parserImpls.ftl
定义class 和 imports
定义关键字 config.fmpp
定义自定义解析 statementParserMethods
测试类
代码示例
Github

Calcite自定义SQL解析
常用方法和配置
config.fmpp
calcite 模板配置

data: {
parser: {
# Generated parser implementation package and class name.
# 生成解析器实现类包和名称
# 包名
package: “com.github.quxiucheng.tutorial.parser.custom”,
# 实体类名
class: “ExtensionSqlParserImpl”,

# List of import statements.<br />    # Example. "org.apache.calcite.sql.*", "java.util.List".<br />    # 导入处理的语句<br />    imports: [<br />    ]<br />    # List of new keywords. Example: "DATABASES", "TABLES". If the keyword is not a reserved<br />    # keyword add it to 'nonReservedKeywords' section.<br />    # 新关键字列表。示例:“DATABASES”、“TABLES”。如果关键字不是一个保留关键字，将其添加到“无保留关键字”部分。<br />    keywords: [<br />    ]<br />    <br />    # List of keywords from "keywords" section that are not reserved.<br />    # “keywords”部分中未保留的关键字列表。<br />    nonReservedKeywords: [<br />        "A"<br />        "ABSENT"<br />        "ABSOLUTE"<br />        "ACTION"<br />        "ADA"<br />        "ADD"<br />        "ADMIN"<br />        "AFTER"<br />        "ALWAYS"<br />        "APPLY"<br />        "ASC"<br />        "ASSERTION"<br />        "ASSIGNMENT"<br />        "ATTRIBUTE"<br />        "ATTRIBUTES"<br />        "BEFORE"<br />        "BERNOULLI"<br />        "BREADTH"<br />        "C"<br />        "CASCADE"<br />        "CATALOG"<br />        "CATALOG_NAME"<br />        "CENTURY"<br />        "CHAIN"<br />        "CHARACTER_SET_CATALOG"<br />        "CHARACTER_SET_NAME"<br />        "CHARACTER_SET_SCHEMA"<br />        "CHARACTERISTICS"<br />        "CHARACTERS"<br />        "CLASS_ORIGIN"<br />        "COBOL"<br />        "COLLATION"<br />        "COLLATION_CATALOG"<br />        "COLLATION_NAME"<br />        "COLLATION_SCHEMA"<br />        "COLUMN_NAME"<br />        "COMMAND_FUNCTION"<br />        "COMMAND_FUNCTION_CODE"<br />        "COMMITTED"<br />        "CONDITION_NUMBER"<br />        "CONDITIONAL"<br />        "CONNECTION"<br />        "CONNECTION_NAME"<br />        "CONSTRAINT_CATALOG"<br />        "CONSTRAINT_NAME"<br />        "CONSTRAINT_SCHEMA"<br />        "CONSTRAINTS"<br />        "CONSTRUCTOR"<br />        "CONTINUE"<br />        "CURSOR_NAME"<br />        "DATA"<br />        "DATABASE"<br />        "DATETIME_INTERVAL_CODE"<br />        "DATETIME_INTERVAL_PRECISION"<br />        "DECADE"<br />        "DEFAULTS"<br />        "DEFERRABLE"<br />        "DEFERRED"<br />        "DEFINED"<br />        "DEFINER"<br />        "DEGREE"<br />        "DEPTH"<br />        "DERIVED"<br />        "DESC"<br />        "DESCRIPTION"<br />        "DESCRIPTOR"<br />        "DIAGNOSTICS"<br />        "DISPATCH"<br />        "DOMAIN"<br />        "DOW"<br />        "DOY"<br />        "DYNAMIC_FUNCTION"<br />        "DYNAMIC_FUNCTION_CODE"<br />        "ENCODING"<br />        "EPOCH"<br />        "ERROR"<br />        "EXCEPTION"<br />        "EXCLUDE"<br />        "EXCLUDING"<br />        "FINAL"<br />        "FIRST"<br />        "FOLLOWING"<br />        "FORMAT"<br />        "FORTRAN"<br />        "FOUND"<br />        "FRAC_SECOND"<br />        "G"<br />        "GENERAL"<br />        "GENERATED"<br />        "GEOMETRY"<br />        "GO"<br />        "GOTO"<br />        "GRANTED"<br />        "HIERARCHY"<br />        "IMMEDIATE"<br />        "IMMEDIATELY"<br />        "IMPLEMENTATION"<br />        "INCLUDING"<br />        "INCREMENT"<br />        "INITIALLY"<br />        "INPUT"<br />        "INSTANCE"<br />        "INSTANTIABLE"<br />        "INVOKER"<br />        "ISODOW"<br />        "ISOYEAR"<br />        "ISOLATION"<br />        "JAVA"<br />        "JSON"<br />        "K"<br />        "KEY"<br />        "KEY_MEMBER"<br />        "KEY_TYPE"<br />        "LABEL"<br />        "LAST"<br />        "LENGTH"<br />        "LEVEL"<br />        "LIBRARY"<br />        "LOCATOR"<br />        "M"<br />        "MAP"<br />        "MATCHED"<br />        "MAXVALUE"<br />        "MICROSECOND"<br />        "MESSAGE_LENGTH"<br />        "MESSAGE_OCTET_LENGTH"<br />        "MESSAGE_TEXT"<br />        "MILLISECOND"<br />        "MILLENNIUM"<br />        "MINVALUE"<br />        "MORE_"<br />        "MUMPS"<br />        "NAME"<br />        "NAMES"<br />        "NANOSECOND"<br />        "NESTING"<br />        "NORMALIZED"<br />        "NULLABLE"<br />        "NULLS"<br />        "NUMBER"<br />        "OBJECT"<br />        "OCTETS"<br />        "OPTION"<br />        "OPTIONS"<br />        "ORDERING"<br />        "ORDINALITY"<br />        "OTHERS"<br />        "OUTPUT"<br />        "OVERRIDING"<br />        "PAD"<br />        "PARAMETER_MODE"<br />        "PARAMETER_NAME"<br />        "PARAMETER_ORDINAL_POSITION"<br />        "PARAMETER_SPECIFIC_CATALOG"<br />        "PARAMETER_SPECIFIC_NAME"<br />        "PARAMETER_SPECIFIC_SCHEMA"<br />        "PARTIAL"<br />        "PASCAL"<br />        "PASSING"<br />        "PASSTHROUGH"<br />        "PAST"<br />        "PATH"<br />        "PLACING"<br />        "PLAN"<br />        "PLI"<br />        "PRECEDING"<br />        "PRESERVE"<br />        "PRIOR"<br />        "PRIVILEGES"<br />        "PUBLIC"<br />        "QUARTER"<br />        "READ"<br />        "RELATIVE"<br />        "REPEATABLE"<br />        "REPLACE"<br />        "RESTART"<br />        "RESTRICT"<br />        "RETURNED_CARDINALITY"<br />        "RETURNED_LENGTH"<br />        "RETURNED_OCTET_LENGTH"<br />        "RETURNED_SQLSTATE"<br />        "RETURNING"<br />        "ROLE"<br />        "ROUTINE"<br />        "ROUTINE_CATALOG"<br />        "ROUTINE_NAME"<br />        "ROUTINE_SCHEMA"<br />        "ROW_COUNT"<br />        "SCALAR"<br />        "SCALE"<br />        "SCHEMA"<br />        "SCHEMA_NAME"<br />        "SCOPE_CATALOGS"<br />        "SCOPE_NAME"<br />        "SCOPE_SCHEMA"<br />        "SECTION"<br />        "SECURITY"<br />        "SELF"<br />        "SEQUENCE"<br />        "SERIALIZABLE"<br />        "SERVER"<br />        "SERVER_NAME"<br />        "SESSION"<br />        "SETS"<br />        "SIMPLE"<br />        "SIZE"<br />        "SOURCE"<br />        "SPACE"<br />        "SPECIFIC_NAME"<br />        "SQL_BIGINT"<br />        "SQL_BINARY"<br />        "SQL_BIT"<br />        "SQL_BLOB"<br />        "SQL_BOOLEAN"<br />        "SQL_CHAR"<br />        "SQL_CLOB"<br />        "SQL_DATE"<br />        "SQL_DECIMAL"<br />        "SQL_DOUBLE"<br />        "SQL_FLOAT"<br />        "SQL_INTEGER"<br />        "SQL_INTERVAL_DAY"<br />        "SQL_INTERVAL_DAY_TO_HOUR"<br />        "SQL_INTERVAL_DAY_TO_MINUTE"<br />        "SQL_INTERVAL_DAY_TO_SECOND"<br />        "SQL_INTERVAL_HOUR"<br />        "SQL_INTERVAL_HOUR_TO_MINUTE"<br />        "SQL_INTERVAL_HOUR_TO_SECOND"<br />        "SQL_INTERVAL_MINUTE"<br />        "SQL_INTERVAL_MINUTE_TO_SECOND"<br />        "SQL_INTERVAL_MONTH"<br />        "SQL_INTERVAL_SECOND"<br />        "SQL_INTERVAL_YEAR"<br />        "SQL_INTERVAL_YEAR_TO_MONTH"<br />        "SQL_LONGVARBINARY"<br />        "SQL_LONGVARNCHAR"<br />        "SQL_LONGVARCHAR"<br />        "SQL_NCHAR"<br />        "SQL_NCLOB"<br />        "SQL_NUMERIC"<br />        "SQL_NVARCHAR"<br />        "SQL_REAL"<br />        "SQL_SMALLINT"<br />        "SQL_TIME"<br />        "SQL_TIMESTAMP"<br />        "SQL_TINYINT"<br />        "SQL_TSI_DAY"<br />        "SQL_TSI_FRAC_SECOND"<br />        "SQL_TSI_HOUR"<br />        "SQL_TSI_MICROSECOND"<br />        "SQL_TSI_MINUTE"<br />        "SQL_TSI_MONTH"<br />        "SQL_TSI_QUARTER"<br />        "SQL_TSI_SECOND"<br />        "SQL_TSI_WEEK"<br />        "SQL_TSI_YEAR"<br />        "SQL_VARBINARY"<br />        "SQL_VARCHAR"<br />        "STATE"<br />        "STATEMENT"<br />        "STRUCTURE"<br />        "STYLE"<br />        "SUBCLASS_ORIGIN"<br />        "SUBSTITUTE"<br />        "TABLE_NAME"<br />        "TEMPORARY"<br />        "TIES"<br />        "TIMESTAMPADD"<br />        "TIMESTAMPDIFF"<br />        "TOP_LEVEL_COUNT"<br />        "TRANSACTION"<br />        "TRANSACTIONS_ACTIVE"<br />        "TRANSACTIONS_COMMITTED"<br />        "TRANSACTIONS_ROLLED_BACK"<br />        "TRANSFORM"<br />        "TRANSFORMS"<br />        "TRIGGER_CATALOG"<br />        "TRIGGER_NAME"<br />        "TRIGGER_SCHEMA"<br />        "TYPE"<br />        "UNBOUNDED"<br />        "UNCOMMITTED"<br />        "UNCONDITIONAL"<br />        "UNDER"<br />        "UNNAMED"<br />        "USAGE"<br />        "USER_DEFINED_TYPE_CATALOG"<br />        "USER_DEFINED_TYPE_CODE"<br />        "USER_DEFINED_TYPE_NAME"<br />        "USER_DEFINED_TYPE_SCHEMA"<br />        "UTF8"<br />        "UTF16"<br />        "UTF32"<br />        "VERSION"<br />        "VIEW"<br />        "WEEK"<br />        "WRAPPER"<br />        "WORK"<br />        "WRITE"<br />        "XML"<br />        "ZONE"<br />    ]<br />    <br />    # List of additional join types. Each is a method with no arguments.<br />    # Example: LeftSemiJoin()<br />    # 其他连接类型的列表。每个方法都是没有参数的方法。<br />    joinTypes: [<br />    ]<br />    <br />    # List of methods for parsing custom SQL statements.<br />    # Return type of method implementation should be 'SqlNode'.<br />    # Example: SqlShowDatabases(), SqlShowTables().<br />    # 用于解析自定义SQL语句的方法列表。<br />    statementParserMethods: [<br />    ]<br />    <br />    # List of methods for parsing custom literals.<br />    # Return type of method implementation should be "SqlNode".<br />    # Example: ParseJsonLiteral().<br />    # 解析自定义文本的方法列表<br />    literalParserMethods: [<br />    ]<br />    <br />    # List of methods for parsing custom data types.<br />    # Return type of method implementation should be "SqlIdentifier".<br />    # 用于解析自定义数据类型的方法列表。<br />    dataTypeParserMethods: [<br />    ]<br />    <br />    # List of methods for parsing extensions to "ALTER <scope>" calls.<br />    # Each must accept arguments "(SqlParserPos pos, String scope)".<br />    # Example: "SqlUploadJarNode"<br />    # 每个都必须接受参数 "(SqlParserPos pos, String scope)".<br />    # 解析扩展到“ALTER ”调用的方法。<br />    alterStatementParserMethods: [<br />    <br />    ]<br />    <br />    # List of methods for parsing extensions to "CREATE [OR REPLACE]" calls.<br />    # Each must accept arguments "(SqlParserPos pos, boolean replace)".<br />    # 解析扩展以"CREATE [OR REPLACE]"调用的方法列表。<br />    # 每个都必须接受参数 "(SqlParserPos pos, String scope)".<br />    createStatementParserMethods: [<br />    ]<br />    <br />    # List of methods for parsing extensions to "DROP" calls.<br />    # Each must accept arguments "(SqlParserPos pos)".<br />    # 解析扩展到“DROP”调用的方法列表。<br />    # 每个都必须接受参数 "(SqlParserPos pos)".<br />    dropStatementParserMethods: [<br />    ]<br />    <br />    # List of files in @includes directory that have parser method<br />    # implementations for parsing custom SQL statements, literals or types<br />    # given as part of "statementParserMethods", "literalParserMethods" or<br />    # "dataTypeParserMethods".<br />    # @includes目录中具有解析器方法的文件列表<br />    # 解析自定义SQL语句、文本或类型的实现<br />    # 作为“statementParserMethods”、“literalParserMethods”或“dataTypeParserMethods”的一部分给出。<br />    implementationFiles: [<br />    "parserImpls.ftl"<br />    ]<br />    <br />    includeCompoundIdentifier: true<br />    includeBraces: true<br />    includeAdditionalDeclarations: false<br />    <br />  }<br />}<br /># freemarker模板的位置<br />freemarkerLinks: {<br />    includes: includes/<br />}<br />1<br />2<br />3<br />4<br />5<br />6<br />7<br />8<br />9<br />10<br />11<br />12<br />13<br />14<br />15<br />16<br />17<br />18<br />19<br />20<br />21<br />22<br />23<br />24<br />25<br />26<br />27<br />28<br />29<br />30<br />31<br />32<br />33<br />34<br />35<br />36<br />37<br />38<br />39<br />40<br />41<br />42<br />43<br />44<br />45<br />46<br />47<br />48<br />49<br />50<br />51<br />52<br />53<br />54<br />55<br />56<br />57<br />58<br />59<br />60<br />61<br />62<br />63<br />64<br />65<br />66<br />67<br />68<br />69<br />70<br />71<br />72<br />73<br />74<br />75<br />76<br />77<br />78<br />79<br />80<br />81<br />82<br />83<br />84<br />85<br />86<br />87<br />88<br />89<br />90<br />91<br />92<br />93<br />94<br />95<br />96<br />97<br />98<br />99<br />100<br />101<br />102<br />103<br />104<br />105<br />106<br />107<br />108<br />109<br />110<br />111<br />112<br />113<br />114<br />115<br />116<br />117<br />118<br />119<br />120<br />121<br />122<br />123<br />124<br />125<br />126<br />127<br />128<br />129<br />130<br />131<br />132<br />133<br />134<br />135<br />136<br />137<br />138<br />139<br />140<br />141<br />142<br />143<br />144<br />145<br />146<br />147<br />148<br />149<br />150<br />151<br />152<br />153<br />154<br />155<br />156<br />157<br />158<br />159<br />160<br />161<br />162<br />163<br />164<br />165<br />166<br />167<br />168<br />169<br />170<br />171<br />172<br />173<br />174<br />175<br />176<br />177<br />178<br />179<br />180<br />181<br />182<br />183<br />184<br />185<br />186<br />187<br />188<br />189<br />190<br />191<br />192<br />193<br />194<br />195<br />196<br />197<br />198<br />199<br />200<br />201<br />202<br />203<br />204<br />205<br />206<br />207<br />208<br />209<br />210<br />211<br />212<br />213<br />214<br />215<br />216<br />217<br />218<br />219<br />220<br />221<br />222<br />223<br />224<br />225<br />226<br />227<br />228<br />229<br />230<br />231<br />232<br />233<br />234<br />235<br />236<br />237<br />238<br />239<br />240<br />241<br />242<br />243<br />244<br />245<br />246<br />247<br />248<br />249<br />250<br />251<br />252<br />253<br />254<br />255<br />256<br />257<br />258<br />259<br />260<br />261<br />262<br />263<br />264<br />265<br />266<br />267<br />268<br />269<br />270<br />271<br />272<br />273<br />274<br />275<br />276<br />277<br />278<br />279<br />280<br />281<br />282<br />283<br />284<br />285<br />286<br />287<br />288<br />289<br />290<br />291<br />292<br />293<br />294<br />295<br />296<br />297<br />298<br />299<br />300<br />301<br />302<br />303<br />304<br />305<br />306<br />307<br />308<br />309<br />310<br />311<br />312<br />313<br />314<br />315<br />316<br />317<br />318<br />319<br />320<br />321<br />322<br />323<br />324<br />325<br />326<br />327<br />328<br />329<br />330<br />331<br />332<br />333<br />334<br />335<br />336<br />337<br />338<br />339<br />340<br />341<br />342<br />343<br />344<br />345<br />346<br />347<br />348<br />349<br />350<br />351<br />352<br />353<br />354<br />355<br />356<br />357<br />358<br />359<br />360<br />361<br />362<br />363<br />364<br />365<br />366<br />367<br />368<br />369<br />370<br />371<br />372<br />373<br />374<br />375<br />376<br />377<br />378<br />379<br />380<br />381<br />382<br />383<br />384<br />385<br />386<br />387<br />388<br />389<br />390<br />391<br />392<br />393<br />394<br />395<br />396<br />配置和Parser.jj文件结合说明<br />package,class,imports<br />主要是负责导入包,设置编译package目录,编译的类名

keywords
定义关键字

nonReservedKeywords
keywords定义关键字中,保留的关键字

joinTypes
join类型

statementParserMethods
解析自定义SQL语句的方法列表,必须实现SqlNode

literalParserMethods
解析自定义文字的方法列表,必须实现SqlNode

dataTypeParserMethods
解析自定义数据类型的方法列表,必须实现SqlIdentifier

alterStatementParserMethods
解析自定义alter语句,必须有构造方法(SqlParserPos pos, String scope)

createStatementParserMethods
解析自定义create语句,必须有构造方法(SqlParserPos pos, boolean replace)

dropStatementParserMethods
解析自定义drop语句,必须有构造方法(SqlParserPos pos)

implementationFiles
模板文件

includeCompoundIdentifier
是否包含CompoundIdentifier解析

includeBraces

includeAdditionalDeclarations

Parser.jj常用方法
javacc教程

getPos()
获取当前token的配置,自定义解析的时候使用

StringLiteral
主要解析是语句中的string类型的字段

select * from table where a=’string’
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Identifier
解析Identifier字段,返回string类型

select SqlIdentifier from table;
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SimpleIdentifier
解析Identifier字段,返回Identifier

select SqlIdentifier from table;
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CompoundIdentifier
解析Identifier字段,返回Identifier

select Compound.SqlIdentifier from table;
select SqlIdentifier from table;
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更多示例代码
更多示例代码-JavaCC

更多示例代码-Java代码

其他常见类
Calcite SQL解析

自定义SQL
自定义SQL语法
create function function_name as class_name
[method]
[with] [(key=value)]
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# 创建函数关键字
create function
# 函数名
hr.custom_function
# as关键字
as
# 类名称
‘com.github.quxiucheng.calcite.func.CustomFunction’
# 可选方法名称
method ‘eval’
# 可选备注信息
comment ‘comment’
# 可选附件变量
property (‘a’=’b’,’c’=’1’)
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定义解析结果类
SqlCreateFunction.java

import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;

import java.util.List;

public class SqlCreateFunction extends SqlCall {

private SqlNode functionName;
private String className;
private SqlNodeList properties;
private String methodName;
private String comment;
public SqlCreateFunction(SqlParserPos pos,<br />                             SqlNode functionName, String className, String methodName, String comment,<br />                             SqlNodeList properties) {
    super(pos);<br />        this.functionName = functionName;<br />        this.className = className;<br />        this.properties = properties;<br />        this.methodName = methodName;<br />    }
public SqlNode getFunctionName() {<br />        return functionName;<br />    }
public String getClassName() {<br />        return className;<br />    }
public String getMethodName() {<br />        return methodName;<br />    }
public SqlNodeList getProperties() {<br />        return properties;<br />    }
public String getComment() {<br />        return comment;<br />    }
@Override<br />    public SqlOperator getOperator() {<br />        return null;<br />    }
@Override<br />    public List<SqlNode> getOperandList() {<br />        return null;<br />    }
@Override<br />    public SqlKind getKind() {<br />        return SqlKind.OTHER_DDL;<br />    }
@Override<br />    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {<br />        writer.keyword("CREATE");<br />        writer.keyword("FUNCTION");<br />        functionName.unparse(writer, leftPrec, rightPrec);<br />        writer.keyword("AS");<br />        writer.print("'" + className + "'");<br />        if (methodName != null) {<br />            writer.newlineAndIndent();<br />            writer.keyword("METHOD");<br />            writer.print("'" + methodName + "'");<br />        }<br />        if (properties != null) {<br />            writer.newlineAndIndent();<br />            writer.keyword("PROPERTY");<br />            SqlWriter.Frame propertyFrame = writer.startList("(", ")");<br />            for (SqlNode property : properties) {<br />                writer.sep(",", false);<br />                writer.newlineAndIndent();<br />                writer.print("  ");<br />                property.unparse(writer, leftPrec, rightPrec);<br />            }<br />            writer.newlineAndIndent();<br />            writer.endList(propertyFrame);<br />        }<br />       if (comment != null) {<br />            writer.newlineAndIndent();<br />            writer.keyword("COMMENT");<br />            writer.print("'" + COMMENT + "'");<br />        }<br />    }<br />}<br />1<br />2<br />3<br />4<br />5<br />6<br />7<br />8<br />9<br />10<br />11<br />12<br />13<br />14<br />15<br />16<br />17<br />18<br />19<br />20<br />21<br />22<br />23<br />24<br />25<br />26<br />27<br />28<br />29<br />30<br />31<br />32<br />33<br />34<br />35<br />36<br />37<br />38<br />39<br />40<br />41<br />42<br />43<br />44<br />45<br />46<br />47<br />48<br />49<br />50<br />51<br />52<br />53<br />54<br />55<br />56<br />57<br />58<br />59<br />60<br />61<br />62<br />63<br />64<br />65<br />66<br />67<br />68<br />69<br />70<br />71<br />72<br />73<br />74<br />75<br />76<br />77<br />78<br />79<br />80<br />81<br />82<br />83<br />84<br />85<br />86<br />87<br />88<br />89<br />90<br />91<br />92<br />93<br />94<br />95<br />96<br />97<br />98<br />99<br />100<br />101<br />102<br />103<br />解析key=value语句<br />SqlProperty.java

import com.google.common.collect.ImmutableList;
import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlLiteral;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.util.NlsString;

import java.util.List;

import static java.util.Objects.requireNonNull;

public class SqlProperty extends SqlCall {

/**<br />     * 定义特殊操作符<br />     */<br />    protected static final SqlOperator OPERATOR =<br />            new SqlSpecialOperator("Property", SqlKind.OTHER);
private SqlNode key;
private SqlNode value;
public SqlProperty(SqlParserPos pos, SqlNode key, SqlNode value) {<br />        super(pos);<br />        this.key = requireNonNull(key, "Property key is missing");<br />        this.value = requireNonNull(value, "Property value is missing");<br />    }
@Override<br />    public SqlOperator getOperator() {<br />        return OPERATOR;<br />    }
@Override<br />    public List<SqlNode> getOperandList() {<br />        return ImmutableList.of(key, value);<br />    }
@Override<br />    public SqlKind getKind() {<br />        return SqlKind.OTHER;<br />    }
@Override<br />    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {<br />        key.unparse(writer, leftPrec, rightPrec);<br />        writer.keyword("=");<br />        value.unparse(writer, leftPrec, rightPrec);<br />    }
public SqlNode getKey() {<br />        return key;<br />    }
public SqlNode getValue() {<br />        return value;<br />    }
public String getKeyString() {<br />        return key.toString();<br />    }
public String getValueString() {<br />        return ((NlsString) SqlLiteral.value(value)).getValue();<br />    }

}
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语法模板 parserImpls.ftl
// 创建函数
SqlNode SqlCreateFunction() :
{
// 声明变量
SqlParserPos createPos;
SqlParserPos propertyPos;
SqlNode functionName = null;
String className = null;
String methodName = null;
String comment = null;
SqlNodeList properties = null;
}
{
// create 关键字

{
// 获取当前token的行列位置
createPos = getPos();
}
// function 关键字

// 函数名
functionName = CompoundIdentifier()
// as关键字

// 类名
{ className = StringLiteralValue(); }
// if语句
[
// method关键字

{
// 方法名称
methodName = StringLiteralValue();
}
]
// if
[
// property 关键字,设置初始化变量

{
// 获取关键字位置
propertyPos = getPos();
SqlNode property;
properties = new SqlNodeList(propertyPos);
}

[
property = PropertyValue()
{
properties.add(property);
}
(

{
property = PropertyValue();
properties.add(property);
}
)*
]

]
// if
[
{
// 备注
comment = StringLiteralValue();
}
]

{<br />        return new SqlCreateFunction(createPos, functionName, className, methodName, comment, properties);<br />    }<br />}

JAVACODE String StringLiteralValue() {
SqlNode sqlNode = StringLiteral();
return ((NlsString) SqlLiteral.value(sqlNode)).getValue();
}

/*
解析SQL中的key=value形式的属性值
*/
SqlNode PropertyValue() :
{
SqlNode key;
SqlNode value;
SqlParserPos pos;
}
{
key = StringLiteral()
{ pos = getPos(); }
value = StringLiteral()
{
return new SqlProperty(getPos(), key, value);
}
}
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定义class 和 imports
package: “com.github.quxiucheng.calcite.parser.tutorial”

class: “CustomSqlParserImpl”,

imports: [<br />        "com.github.quxiucheng.calcite.parser.tutorial.SqlCreateFunction"<br />        "com.github.quxiucheng.calcite.parser.tutorial.sample.model.*"<br />    ]<br />1<br />2<br />3<br />4<br />5<br />6<br />7<br />8<br />定义关键字 config.fmpp<br />    keywords: [<br />        "PARAMS"<br />        "COMMENT"<br />        "PROPERTY" <br />    ]<br />1<br />2<br />3<br />4<br />5<br />定义自定义解析 statementParserMethods<br />  statementParserMethods: [<br />        "SqlCreateFunction()"<br />    ]<br />1<br />2<br />3<br />测试类

import org.apache.calcite.config.Lex;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.dialect.OracleSqlDialect;
import org.apache.calcite.sql.parser.SqlParseException;
import org.apache.calcite.sql.parser.SqlParser;

public class SqlCreateFunctionMain {
public static void main(String[] args) throws SqlParseException {
// 解析配置 - mysql设置
SqlParser.Config mysqlConfig = SqlParser.configBuilder()
// 定义解析工厂
.setParserFactory(CustomSqlParserImpl.FACTORY)
.setLex(Lex.MYSQL)
.build();
// 创建解析器
SqlParser parser = SqlParser.create(“”, mysqlConfig);
// Sql语句
String sql = “create function “ +
“hr.custom_function as ‘com.github.quxiucheng.calcite.func.CustomFunction’ “ +
“method ‘eval’ “ +
“property (‘a’=’b’,’c’=’1’) “;
// 解析sql
SqlNode sqlNode = parser.parseQuery(sql);
// 还原某个方言的SQL
System.out.println(sqlNode.toSqlString(OracleSqlDialect.DEFAULT));
}
}

代码示例
https://github.com/quxiucheng/apache-calcite-tutorial/tree/master/calcite-tutorial-2-parser/parser-4-calcite-custom-tutoria

Calcite自定义SQL解析