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Commit bc7fa0c

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feodorfeodor
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Improve scripting language in pgbench
Added: - variable now might contain integer, double, boolean and null values - functions ln, exp - logical AND/OR/NOT - bitwise AND/OR/NOT/XOR - bit right/left shift - comparison operators - IS [NOT] (NULL|TRUE|FALSE) - conditional choice (in form of when/case/then) New operations and functions allow to implement more complicated test scenario. Author: Fabien Coelho with minor editorization by me Reviewed-By: Pavel Stehule, Jeevan Ladhe, me Discussion: https://www.postgresql.org/message-id/flat/alpine.DEB.2.10.1604030742390.31618@sto
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‎doc/src/sgml/ref/pgbench.sgml

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@@ -904,14 +904,32 @@ pgbench <optional> <replaceable>options</replaceable> </optional> <replaceable>d
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<para>
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Sets variable <replaceable>varname</replaceable> to a value calculated
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from <replaceable>expression</replaceable>.
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The expression may contain integer constants such as <literal>5432</literal>,
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The expression may contain the <literal>NULL</literal> constant,
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boolean constants <literal>TRUE</literal> and <literal>FALSE</literal>,
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integer constants such as <literal>5432</literal>,
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double constants such as <literal>3.14159</literal>,
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references to variables <literal>:</literal><replaceable>variablename</replaceable>,
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unary operators (<literal>+</literal>, <literal>-</literal>) and binary operators
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(<literal>+</literal>, <literal>-</literal>, <literal>*</literal>, <literal>/</literal>,
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<literal>%</literal>) with their usual precedence and associativity,
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<link linkend="pgbench-builtin-functions">function calls</link>, and
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parentheses.
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<link linkend="pgbench-builtin-operators">operators</link>
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with their usual SQL precedence and associativity,
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<link linkend="pgbench-builtin-functions">function calls</link>,
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SQL <link linkend="functions-case"><token>CASE</token> generic conditional
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expressions</link> and parentheses.
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</para>
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<para>
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Functions and most operators return <literal>NULL</literal> on
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<literal>NULL</literal> input.
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</para>
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<para>
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For conditional purposes, non zero numerical values are
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<literal>TRUE</literal>, zero numerical values and <literal>NULL</literal>
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are <literal>FALSE</literal>.
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</para>
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<para>
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When no final <token>ELSE</token> clause is provided to a
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<token>CASE</token>, the default value is <literal>NULL</literal>.
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</para>
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<para>
@@ -920,6 +938,7 @@ pgbench <optional> <replaceable>options</replaceable> </optional> <replaceable>d
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\set ntellers 10 * :scale
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\set aid (1021 * random(1, 100000 * :scale)) % \
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(100000 * :scale) + 1
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\set divx CASE WHEN :x &lt;&gt; 0 THEN :y/:x ELSE NULL END
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</programlisting></para>
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</listitem>
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</varlistentry>
@@ -996,6 +1015,177 @@ pgbench <optional> <replaceable>options</replaceable> </optional> <replaceable>d
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</variablelist>
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</refsect2>
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<refsect2 id="pgbench-builtin-operators">
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<title>Built-In Operators</title>
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<para>
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The arithmetic, bitwise, comparison and logical operators listed in
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<xref linkend="pgbench-operators"/> are built into <application>pgbench</application>
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and may be used in expressions appearing in
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<link linkend="pgbench-metacommand-set"><literal>\set</literal></link>.
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</para>
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<table id="pgbench-operators">
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<title>pgbench Operators by increasing precedence</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry>Operator</entry>
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<entry>Description</entry>
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<entry>Example</entry>
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<entry>Result</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>OR</literal></entry>
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<entry>logical or</entry>
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<entry><literal>5 or 0</literal></entry>
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<entry><literal>TRUE</literal></entry>
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</row>
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<row>
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<entry><literal>AND</literal></entry>
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<entry>logical and</entry>
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<entry><literal>3 and 0</literal></entry>
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<entry><literal>FALSE</literal></entry>
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</row>
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<row>
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<entry><literal>NOT</literal></entry>
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<entry>logical not</entry>
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<entry><literal>not false</literal></entry>
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<entry><literal>TRUE</literal></entry>
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</row>
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<row>
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<entry><literal>IS [NOT] (NULL|TRUE|FALSE)</literal></entry>
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<entry>value tests</entry>
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<entry><literal>1 is null</literal></entry>
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<entry><literal>FALSE</literal></entry>
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</row>
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<row>
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<entry><literal>ISNULL|NOTNULL</literal></entry>
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<entry>null tests</entry>
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<entry><literal>1 notnull</literal></entry>
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<entry><literal>TRUE</literal></entry>
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</row>
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<row>
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<entry><literal>=</literal></entry>
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<entry>is equal</entry>
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<entry><literal>5 = 4</literal></entry>
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<entry><literal>FALSE</literal></entry>
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</row>
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<row>
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<entry><literal>&lt;&gt;</literal></entry>
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<entry>is not equal</entry>
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<entry><literal>5 &lt;&gt; 4</literal></entry>
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<entry><literal>TRUE</literal></entry>
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</row>
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<row>
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<entry><literal>!=</literal></entry>
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<entry>is not equal</entry>
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<entry><literal>5 != 5</literal></entry>
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<entry><literal>FALSE</literal></entry>
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</row>
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<row>
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<entry><literal>&lt;</literal></entry>
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<entry>lower than</entry>
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<entry><literal>5 &lt; 4</literal></entry>
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<entry><literal>FALSE</literal></entry>
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</row>
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<row>
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<entry><literal>&lt;=</literal></entry>
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<entry>lower or equal</entry>
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<entry><literal>5 &lt;= 4</literal></entry>
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<entry><literal>FALSE</literal></entry>
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</row>
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<row>
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<entry><literal>&gt;</literal></entry>
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<entry>greater than</entry>
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<entry><literal>5 &gt; 4</literal></entry>
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<entry><literal>TRUE</literal></entry>
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</row>
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<row>
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<entry><literal>&gt;=</literal></entry>
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<entry>greater or equal</entry>
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<entry><literal>5 &gt;= 4</literal></entry>
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<entry><literal>TRUE</literal></entry>
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</row>
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<row>
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<entry><literal>|</literal></entry>
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<entry>integer bitwise OR</entry>
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<entry><literal>1 | 2</literal></entry>
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<entry><literal>3</literal></entry>
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</row>
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<row>
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<entry><literal>#</literal></entry>
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<entry>integer bitwise XOR</entry>
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<entry><literal>1 # 3</literal></entry>
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<entry><literal>2</literal></entry>
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</row>
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<row>
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<entry><literal>&amp;</literal></entry>
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<entry>integer bitwise AND</entry>
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<entry><literal>1 &amp; 3</literal></entry>
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<entry><literal>1</literal></entry>
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</row>
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<row>
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<entry><literal>~</literal></entry>
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<entry>integer bitwise NOT</entry>
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<entry><literal>~ 1</literal></entry>
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<entry><literal>-2</literal></entry>
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</row>
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<row>
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<entry><literal>&lt;&lt;</literal></entry>
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<entry>integer bitwise shift left</entry>
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<entry><literal>1 &lt;&lt; 2</literal></entry>
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<entry><literal>4</literal></entry>
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</row>
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<row>
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<entry><literal>&gt;&gt;</literal></entry>
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<entry>integer bitwise shift right</entry>
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<entry><literal>8 &gt;&gt; 2</literal></entry>
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<entry><literal>2</literal></entry>
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</row>
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<row>
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<entry><literal>+</literal></entry>
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<entry>addition</entry>
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<entry><literal>5 + 4</literal></entry>
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<entry><literal>9</literal></entry>
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</row>
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<row>
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<entry><literal>-</literal></entry>
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<entry>substraction</entry>
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<entry><literal>3 - 2.0</literal></entry>
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<entry><literal>1.0</literal></entry>
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</row>
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<row>
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<entry><literal>*</literal></entry>
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<entry>multiplication</entry>
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<entry><literal>5 * 4</literal></entry>
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<entry><literal>20</literal></entry>
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</row>
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<row>
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<entry><literal>/</literal></entry>
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<entry>division (integer truncates the results)</entry>
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<entry><literal>5 / 3</literal></entry>
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<entry><literal>1</literal></entry>
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</row>
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<row>
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<entry><literal>%</literal></entry>
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<entry>modulo</entry>
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<entry><literal>3 % 2</literal></entry>
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<entry><literal>1</literal></entry>
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</row>
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<row>
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<entry><literal>-</literal></entry>
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<entry>opposite</entry>
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<entry><literal>- 2.0</literal></entry>
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<entry><literal>-2.0</literal></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect2>
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<refsect2 id="pgbench-builtin-functions">
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<title>Built-In Functions</title>
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<entry><literal>double(5432)</literal></entry>
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<entry><literal>5432.0</literal></entry>
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</row>
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<row>
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<entry><literal><function>exp(<replaceable>x</replaceable>)</function></literal></entry>
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<entry>double</entry>
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<entry>exponential</entry>
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<entry><literal>exp(1.0)</literal></entry>
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<entry><literal>2.718281828459045</literal></entry>
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</row>
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<row>
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<entry><literal><function>greatest(<replaceable>a</replaceable> [, <replaceable>...</replaceable> ] )</function></literal></entry>
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<entry>double if any <replaceable>a</replaceable> is double, else integer</entry>
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<entry><literal>least(5, 4, 3, 2.1)</literal></entry>
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<entry><literal>2.1</literal></entry>
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</row>
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<row>
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<entry><literal><function>ln(<replaceable>x</replaceable>)</function></literal></entry>
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<entry>double</entry>
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<entry>natural logarithm</entry>
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<entry><literal>ln(2.718281828459045)</literal></entry>
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<entry><literal>1.0</literal></entry>
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</row>
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<row>
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<entry><literal><function>mod(<replaceable>i</replaceable>, <replaceable>bj</replaceable>)</function></literal></entry>
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<entry>integer</entry>
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<entry>modulo</entry>
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<entry><literal>mod(54, 32)</literal></entry>
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<entry><literal>22</literal></entry>
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</row>
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<row>
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<entry><literal><function>pi()</function></literal></entry>
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<entry>double</entry>

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