org.apache.flink.table.utils

类 PrintUtils

java.lang.Object

org.apache.flink.table.utils.PrintUtils

@Internal
public class PrintUtils
extends Object

Utilities for print formatting.

字段概要

字段

限定符和类型	字段和说明
static int	MAX_COLUMN_WIDTH
static String	NULL_COLUMN

方法概要

限定符和类型	方法和说明
static int[]	columnWidthsByType(List<TableColumn> columns, int maxColumnWidth, String nullColumn, String rowKindColumn) Try to derive column width based on column types.
static String	genBorderLine(int[] colWidths)
static int	getStringDisplayWidth(String str)
static boolean	isFullWidth(int codePoint) Check codePoint is FullWidth or not according to Unicode Standard version 12.0.0.
static void	printAsTableauForm(TableSchema tableSchema, Iterator<org.apache.flink.types.Row> it, PrintWriter printWriter) Displays the result in a tableau form.
static void	printAsTableauForm(TableSchema tableSchema, Iterator<org.apache.flink.types.Row> it, PrintWriter printWriter, int maxColumnWidth, String nullColumn, boolean deriveColumnWidthByType) Displays the result in a tableau form.
static void	printSingleRow(int[] colWidths, String[] cols, PrintWriter printWriter)
static String[]	rowToString(org.apache.flink.types.Row row)
static String[]	rowToString(org.apache.flink.types.Row row, String nullColumn)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

MAX_COLUMN_WIDTH

public static final int MAX_COLUMN_WIDTH

另请参阅:

常量字段值

NULL_COLUMN

public static final String NULL_COLUMN

另请参阅:

常量字段值

方法详细资料

printAsTableauForm

public static void printAsTableauForm(TableSchema tableSchema,
                                      Iterator<org.apache.flink.types.Row> it,
                                      PrintWriter printWriter)

Displays the result in a tableau form.

For example: +-------------+---------+-------------+ | boolean_col | int_col | varchar_col | +-------------+---------+-------------+ | true | 1 | abc | | false | 2 | def | | (NULL) | (NULL) | (NULL) | +-------------+---------+-------------+ 3 rows in result

Changelog is not supported until FLINK-16998 is finished.

printAsTableauForm

public static void printAsTableauForm(TableSchema tableSchema,
                                      Iterator<org.apache.flink.types.Row> it,
                                      PrintWriter printWriter,
                                      int maxColumnWidth,
                                      String nullColumn,
                                      boolean deriveColumnWidthByType)

Displays the result in a tableau form.

NOTE: please make sure the data to print is small enough to be stored in java heap memory if the column width is derived from content (`deriveColumnWidthByType` is false).

For example:

 +-------------+---------+-------------+
 | boolean_col | int_col | varchar_col |
 +-------------+---------+-------------+
 |        true |       1 |         abc |
 |       false |       2 |         def |
 |      (NULL) |  (NULL) |      (NULL) |
 +-------------+---------+-------------+
 

参数:

tableSchema - The schema of the data to print

it - The iterator for the data to print

printWriter - The writer to write to

maxColumnWidth - The max width of a column

nullColumn - The string representation of a null value

deriveColumnWidthByType - A flag to indicate whether the column width is derived from type (true) or content (false).

rowToString

public static String[] rowToString(org.apache.flink.types.Row row)

rowToString

public static String[] rowToString(org.apache.flink.types.Row row,
                                   String nullColumn)

genBorderLine

public static String genBorderLine(int[] colWidths)

columnWidthsByType

public static int[] columnWidthsByType(List<TableColumn> columns,
                                       int maxColumnWidth,
                                       String nullColumn,
                                       @Nullable
                                       String rowKindColumn)

Try to derive column width based on column types. If result set is not small enough to be stored in java heap memory, we can't determine column widths based on column values.

printSingleRow

public static void printSingleRow(int[] colWidths,
                                  String[] cols,
                                  PrintWriter printWriter)

getStringDisplayWidth

public static int getStringDisplayWidth(String str)

isFullWidth

public static boolean isFullWidth(int codePoint)

Check codePoint is FullWidth or not according to Unicode Standard version 12.0.0. See http://unicode.org/reports/tr11/